Εικόνες σελίδας
PDF
Ηλεκτρ. έκδοση

21. A banker gave a

interest in a bank to one son, a

interest to another son, and the remaining interest, valued What was the value of the bank?

at $10000, to his wife.

22. A lot was sold for $360, which was of what it cost. Find the cost.

23. Mr. Amos sold his farm for $3300, which was & more than it cost him. Find the cost.

24. A typewriter spends How much is his income?

of his income and saves $400.

25. A suit of clothes was sold for $18, which was less than it cost. Find the cost.

26. A merchant sold apples at $1.80 a barrel, which was more than they cost him. How much did they cost per barrel?

27. There are 1200 pupils in a certain school. The number of boys is of the number of girls. How many girls are there in the school?

28. The united ages of Alice and Mary are 28 years; Alice is as old as Mary. How old is Alice?

29. A lady paid $30 for a watch, which was more than it cost. Find the cost.

30. A house that cost $1200 was sold for more than the cost. How much was gained?

31. A has 45 cents, which is more than B has. How much has B?

32. How much will a two-thirds interest in a store cost, when a four-fifths interest sells for $6000?

33. There are 40 pupils in a school, and of them are boys. How many girls are there in the school?

34. If a man owns of a mill, and sells of his interest for $3000, what is the value of the mill ?

35. A lady paid $35 for a cloak. of the cost of the cloak was of what she paid for other clothing. How much did all cost?

36. A house and lot cost $8000. The lot cost as much as the house. How much did the lot cost?

37. A traveler went 30 miles in two days; the first day he went 11⁄2 times as far as the second. How many miles did he travel the first day?

38. A sold a watch to B for more than it cost him; B sold it to C for $20, thereby losing of what it cost him. How much did A pay for it?

39. The difference between two numbers is 36, and the greater is three times the less. What are the numbers?

40. If to of Mr. Barnhart's salary you add $40, the sum will be of his salary. How much is his salary? 景

41. A merchant sold a dry goods store, receiving of the price in cash. He invested of the sum received in a jew

elry store bought at $900. goods store sold?

For how much was the dry

42. What is the value of of a ship if of it is worth $48000?

43. A man invested & of his money in a lot. Had he paid $100 more he would have invested of his money. Find the cost of the lot.

44. Two merchants had a profit of $9600.

After paying of it for rent, they divided the rest so that one received as much as the other. How much did each receive? ·

45. If Wayne can do a piece of work in 6 days, what part of it can he do in 1 day? If Ray can do the same work in 4 days, what part of it can he do in 1 day?

46. What part can Ray and Wayne both do in 1 day? 47. If Ray and Wayne can do of it in 1 day, in how many days can they do the whole work, working together?

48. If 4 men can do a piece of work in 3 days, how long will it take 1 man to do it?

49. If one man can do a piece of work in 12 days, how long will it take 2 men to do it?

50. If 8 men can do a piece of work in 2 days, how long will it take 5 men to do it?

51. A jeweler sold a watch for $60, and gained † of the What was the cost of the watch?

cost.

52. A horse, sleigh, and harness cost $220; the sleigh cost twice as much as the harness, and the horse cost 4 times as much as the sleigh. Find the cost of each.

53. Ira can do a piece of work in 12 days; Baxter can do it in 16 days. If Baxter's wages are $1.50 a day, how much per day should Ira receive?

54. A man has three houses which together are worth $5700. The second house is worth twice as much as the first, and the third is worth as much as the other two. How much is the third house worth?

55. If A can do a piece of work in 14 days, B in 3 days, and C in 4 days, in what time can they do it working together? SUGGESTION. Since A does the whole work in days, he does of 景 it in a day; B does in a day, and C in a day. What part of the work do they do together in a day? How long, then, will it take them to do the whole work together?

56. À man bought three automobiles. The first cost $1500, the second cost 12 times as much as the third, and the third cost twice as much as the first. Find the cost of the second and the third.

PERCENTAGE

The term per cent means hundredths or by the hundred. The sign for it is %.

Thus, five hundredths may be written 15, .05, 5 per cent, or 5%. These are called equivalents.

Percentage is the process of computing by hundredths. It is simply an application of decimal fractions.

Write both as a decimal and as a common fraction in its lowest terms each of the following per cents; thus, 10% = .10=

[merged small][merged small][ocr errors][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small]

Write the following decimals as fractions and per cents:

[blocks in formation]

Write the following as decimals and as per cents:

[blocks in formation]

Memorize the following equivalents:

[merged small][merged small][ocr errors][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small]

49. What is 50% of 100? 40? 10? 2? ? ?

50. What is 16% of 90? 150? 120? 9? 12? 3?

51. What is 33% of 3000? 2000? 50? 75? 100 ?

52. What is 12% of 200? 32? 96? 4? 6? 1?

53. What is 371% of 72? 56? 800? 2000? 40? 8?

54. What is 20% of 400? 600? 14 ?? 16? 20?

55. Find 121% of 16; of 48; of 72; of 96; of 168; of 800; of 220; of 404.

56. Find 5% of 25; of 50; of 75; of 100; of 125.

In each example in 56 we have two terms, a per cent and a number. In each case we are to find 5% of the number. The number of which we take the 180 (viz. 25, 50, etc.) is called the base. The number of hundredths (5) to be taken is called the rate, and the number of hundredths actually taken, that is, the answer, is called the percentage.

[ocr errors]

The base is the number on which the percentage is computed.

The rate or rate per cent is the number of hundredths. We generally express rate as a decimal.

The percentage is the product obtained by taking a certain per cent of the base.

The sum or the amount is the sum of the base and the percentage.

The difference is the base minus the percentage.

« ΠροηγούμενηΣυνέχεια »