What is the interest of 50 dols. for 12 months? Ans. 3 dols. What is the amount? Ans. 53 dols. What is the interest of 80 dols. for 10 months? Ans, 4 dollars. What is the amount? Ans. 84 dollars. What is the interest of 8 dols. for 4 months? Ans. 16 cents. What is the amount? Ans. 8 dollars 16 cents. What is the interest of 4 dols. for 4 months? Ans. 8 cents. > What is the amount? Ans. 2 dols. 8 cents. What is the interest of 2 dols. for 4 months! Ans. 2 cents. What is the interest of 20 dols. for 2 months! Ans. 20 cents. What is the amount? Ans. 20 dols, 20 cents. What is the interest of 8 dols. for 1 month? Ans. 4 cents. What is the amount? Ans. 8 dols. 4 cents. What is the interest of 80 dols. for 1 month! Ans. 40 cents. What is the amount? Ans. 80 dols. 40 cents. What is the interest of 800 dols. for one month? Ans. 4 dols. What is the amount? Ans. 804 dols. What is the interest of 8000 dols. for 1 month! Ans. 40 dols. What is the amount? Ans. 8040 dols. What is the interest of 5 dols. for 12 months? Ans. 30 cents. What is the amount? Ans. 5 dols. 30 cents. What is the interest of 50 dols. for one year? Ans. 3 dols. What is the amount? Ans. 53 cols. What is the interest of 500 dollars for one year? Ans. 30 dols. El What is the amount? Ans. 5030 dols. What is the interest of 5000 dols. for one year? Ans. 300 dols. What is the amount? Ans. 5300 dols. What is the interest of 1 dollar for 4 years?. Ans. 24 cents. What is the amount? Ans. I dol. 24 cents. What is the interest of 1 dol. for 12 years? Ans. 60 cents. What is the amount? Ans. I dol. 60 cents. What is the interest of 50 dols. for 2 years and 6 months? Ans. 7 dols. 50 cents. What is the amount? Ans. 57 dols. 50 cents. What is the interest of £100 for 8 months? Ans. £4. What is the amount? Ans. £104. What is the interest of £10 for 1 year and 8 months? Ans. £2. What is the amount? Ans. £12. What is the interest of 2 dols. 50 cents for 2 months? Ans. 2 cents 5 mill. What is the amount? Ans. 2 dols. 52 cents. 5 mills. What is the interest of 6 dols. 50 cents, for 2 months. 6.1 cents. Remark. As a difficulty arises in directing the scholar to multiply by the number of months when the sum consists of years, months, and days, together, the following table is composed, by putting 3) under the given number of days,--reducing the fraction to its lowest terms, and a rule subjojn. ed, by which the interest for any number of days may be found readily with fewer figures than any other way. What part of a month is 1 day? Ans. to What part are 4 days? Ans. . Remark. The parts of a month for any number of days from 10 to 30 or more, may be found by the table above ; as 5 are then 25 are 5 times as many, i. e. or by putting 30 under the given days for a denominator, and for the sake of convenience in multiplying reducing the fraction to its lowest terms. For example: what part of a month are 20 days? Ars. 10 are = As preparatory to the following rule how do you get , of a fraction? Ans. Double the denominator. How much is of 3? Ans. How prove this? Ans. *3 is equal to and Ito and I off is a quarter; then of 13 is td. How much is of 188? Ans. 188. In multiplying by half the number of months when the sum consists of days, what is the rule? Ans. Double the denominator and multiply and cut off as before. EXAMPLES. What is the interest of 60 dols. for 5 days? 5 are of a month. 12)60 Ans. 5 cents. Where did you get your 12! Ans. Double of o the denominator. What is the interest of 40 dollars for ten days Ans. 10 are $ 6)40 6,4 cents. What is the interest of 12 dollars for 20 days? Ans. 20 are 12 Note.--The scholar will recollect his rule, that to multiply by a fraction, division is necessary, and when the numerator is 19 division alone is necessary. The longest of the remaining sums in this rule may be performed on the slate at recitation. What is the interest of 120 dols. for 8 years, 4 months, and 15 days. 120 months. 30 Ans. $60, 30 Where did you get the 4? Ans, 15 are ; 1 of is . What is the interest of 60 dols. for 16 years S months and 10 days. 6)60,00 annexing 2 cyphers for 10 multipiying by the a number of months. Ans. $60,10. The ten is thus placed because 60 only is to be mul-. tiplied by What is the interest of 12 dollars for 41 years 8 months and 25 days? Ans. 30,95 What is the interest of 100 dollars for 15 days? Ans. 25 cents. What is the interest of 24 dollars for of a month? Ans. 4 cents. To give as difficult a sum perhaps, as any, to show the conciseness of the rule; what is the interest of 1200 dols. for 12 years, il months and 29 days? 1200 1200 771 29 10800 8400 · 2400 8400 600 6,0)3480,0 580 580 $ 935,80 with the usual nam ber of figures. To cast the interest when the rate is not 6 what do first? Ans. Find the interest as before, for 6 per cent. What do then? Ans. Multiply by the given rate and divide by 6. EXAMPLES. What is the interest of 120 dollars for 15 years, 11 months and 25 days at 9 per cent. |