The Metric System.

ORAL EXERCISE

1. What is the Metric System?

2. How does it compare with the English System?

3. Why is it necessary for you to understand the Metric System?

4. Recite the Table of Length; of Surfaces; of Volumes. 5. Recite the Table of Weights; of Capacity.

6. What is the difference between the prefixes:

(a) deci and deka?
(b) centi and hekto?

(c) milli and kilo?

WRITTEN EXERCISE

1. After traveling 128 Km. from the garage, an automobile broke down. How many mi. had it traveled?

2. A girl weighs 42.3 Kg. How many pounds does she weigh?

Change to English equivalents these metric measures:

12. A junk dealer sells 3 metric tons of scrap iron at 4¢ a kilogram. How much does he receive?

13. An oil dealer orders 3000 1. of gasoline. About how many gal. does he order?

Change the following to the metric equivalents:

20. How many lb. are there in 14 bags of flour, if each weighs 14 Kg.?

21. A French tire factory received a consignment of 8448 oz. of rubber. How many Kg. were there in the lot?

GENERAL WRITTEN PROBLEMS

1. What are the proceeds of a note of $250 dated Mar. 28, 1915 and due in 3 mo., discounted on Apr. 10, at 6%? 2. If gas is billed at 80¢ per 1000 cu. ft., what will be the cost of 3460 cu. ft. of gas?

3. A man bought a house and lot for $6835. He repaired the house at a cost of $1250. The house was burned and he received $3575 insurance. He then sold the lot for $4516. Did he gain or lose and what per cent?

4. How many sq. in. of felt will be needed to make a triangular flag of which the base is 2′ 4′′ and the altitude 1' 3"?

5. A cotton goods factory buys 150 bales of cotton, each containing 500 lb., at 14¢ a lb. If the agent receives 3% commission, what is the total cost of the cotton to the manufacturer?

6. One side of a square field is 40 rd. long. How many acres are there in this field? What will it cost to fence it at 70¢ a rd.?

7. On Jan. 1, 1916, William Hendricks bought of the American Hardware Company, a bill of goods amounting to $850 for which he paid by giving his note due March 15, 1916, with interest at 5%. Write the note. What is the interest on the note when due?

8. What is the cost of plastering the walls and ceiling of a room 16' long, 14′ wide, and 9′ high at $.75 a sq. yd.?

9. A street, half a mile long and 60 ft. wide, is paved with granite blocks. If 36 blocks are required to pave one sq. yd., how many will be required to pave the street?

10. A merchant bought potatoes at $1 a bushel and sold them at 30¢ a peck. How much did he gain on 76 bushels? What % did he gain?

11. On June 20, 1917, Henry Bush borrowed of J. T. Adamson $800, payable in one year. On Sept. 15, Mr. Adamson discounted the note at 6%. How much less money did he receive from the bank than he paid Mr. Bush?

12. A corner plot of ground in the shape of a triangle is 280 rd. long at the base and 115 rd. in height. How many acres in this plot?

13. A class in cooking gave a luncheon for which the following material was used: 2 cans salmon at 10¢ a can; 4 eggs at 36¢ a dozen; of a peck of potatoes at 30¢ a peck; 2 cans peas at 10¢ a can; 2 quarts peaches at 25¢ a quart; flour 10; 1 pound butter at 374; 1 pound sugar at 9¢; other items 15¢. Sixteen persons were served. What was the cost per person?

14. The two sides forming the right angle of a right triangle are 38 ft. and 64 ft. Find the area in sq. yd.

15. An agent sold 1600 bu. of grain at 90¢ a bushel and sent his employer $1418.40 as the proceeds of the sale. What was the rate of the agent's commission?

16. After cutting, a block of marble is 8′ long, 21′ wide, and 1 high. Find the total amount of surface to be polished if the marble is to be polished on all sides.

17. Three boys ran a relay race. The first ran exactly 1 Km. in 8 minutes; the second ran 1.3 Km. in 10 minutes; the third finished the race in the combined time of the other two. If the entire distance to be run was 5 Km., how did the speed of the third boy compare in per cent with that of each of the others?

18. What was the distance, in rd., run by each of the boys, in the preceding problem?

VI. BUSINESS FORMS AND PRACTICE

Bills and Invoices. Whenever a customer buys from a wholesale house a quantity of goods, the firm makes out and sends, generally with the goods, a list of the articles bought, the price of each, the place and the date of the sale, and the terms of the sale. This memorandum of goods shipped is called an invoice; from it, the purchaser can check the goods and note what he will be charged. Later, the bill itself will be sent him. This bill, as a rule, will duplicate the information contained in the invoice; but, the invoice is primarily a memorandum for the shipping and receiving departments, whereas the bill is in the nature of a notice of indebtedness, and is for the attention of the accounting departments.

Verify the results as computed in the following invoice. Why is it not receipted?