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9. Of 1 dollar for 12 years at 5 per cent. ?
Ans. 60cts. 10. Of 215 dollars 34 cts. for 4 and a half years, at 3 and a half per cent. ?
Arsa 833, 9icts. 6in. 11. What is the amount of 324 dollars, 61 cents, for 5 years and 5 months, at 6 per cent. ?
sins. $430, 10cts. 826.m. 12. What will 3000l. amount to in 12 years and 10 months, at 6 per cent. ?
Ans. £,5310. 13. What is the interest of 2571. 5s. 1d. for 1 year
and 3 quarters, at 4 per cent. ? Ins. £:18 Os. 1d. 3qrs.
14. What is the interest of 279 dollars, 87 cents for 2 years and a half, at.7 per cent. per annum ?
Ans. $48, 97 cts. 74m. 15. What will 2791. 135. 8d, amount to in 3 years
and a half at 54 per cent. per annum?
Ans. £331 Is. 6d. 16. What is the amount of 341 dols. 60 cts. for 5 years and 3 quarters, at 7 and a half per cent. per annum ?
Ans. $488, 91 }cts. .17. What will 730 dols. amount to at 6 per cent. in 5 years, 7 months and 12 days, or
Ans. $975, 99cts. 18. What is the interest of 1825l. at 5 per cent. per annum, from March 4th, 1796, to March 29th, 1799, (allowing the year to contain 365 days) Ans. £280.
Note.--The Rules for Simple Interest serve also to calculate Commission, Brokerage, Insurance, or any thing else estimated at a rate
12 of a year
COMMISSION, IS an allowance of
cent. to a factor or Cote respondent abroad, for buymg and selling goods for his employer.
1. What will the commission of 8431 10s. come to at
* per cent. ?
per cent. ?
6100 £42 Ss. 6d. 2. Required the commission on 964 dols. 90 cts. at 21
Ans. $21, 71cts. 3. What may a factor demand on 14 percent. commission, for laying out 3568 dollars ?
Ans. $62, 44cts
BROKERAGE, IS an allowance of so much per cent. to persons assisting merchants, or factors, in purchasing or selling goods.
EXAMPLES. 1. What is the brokerage of 7501. 85. 4d. at 68. 84. per cent. ?
£. $. d. 750 8 4 Here I first find the brokerage at 1 1 pound per cent and then for the
given rate, which is of a pound. 7,50 8 4 20
£. s. d. grs.
}) 10 1
Ans. £2 10 0 11
Ans. 830, 93cts. 7 fm. 3. If a broker sells goods to the amount of 5000 dols. what is his demand at 65 cts. per cent. ?
Ans. $S2, 50cts.
4. What may a broker demand, when he sells goorls to the value of 508l. lis. 10d. and I allow him 11 per cent ?
Ans. £7 12s. 8d.
INSURANCE, IS a premium at so much per cent. allowed to persong and ofiices, for making good the loss of ships, houses, merchandize, &c. which may happen froin storms, fire, &ico
1. What is the insurance of 7251. 8s. 10d. at 124 per cent. :
Ans. £90 13s. 71d. 2. What is the insurance of an East-India ship and cargo, valued at 123425 dollars, at 15 per cent. ?'
Aus. $19130, 87cis. 5m. S. A man's house estimated at 3500 dollars, was instred against fire, for 14 per centa year: what insurance did he annually pay?
Ans. $61, 25cts.
SHORT PRACTICAL RULES,
07 months and days.
RULE. If the principal consists of pounds only, cut off tho unit figure, and as it then stands it will be the interest for one month, in shillings and decimal parts.
%. If the principal consists of pounds, shillings, &c. re. duce it to its decimal value; then remove tlie decimal point one place, or figure, further towards the left hand, and as the decimal then stands, it will shew the interest for one month, in shillings, and decimals of a shilling.
1. Required the interest of 541. for seven months and ten days, at 6 per sent
10 days=$)5,4 Interest for one month.
37,8 ditto for 7 months.
Ans. 39,6 shillings=41 19s. 7,2d.
2. What is the interest of 421. 10s. for 11 months, at 6
per cent. ?
£ s. £:
£. s. d.
3. Required the interest of 941. 78. 6d. for one year, five months and a half, at 6 per cent. per annum.
Ans. £8 5s. 1d. 3,5qr's. 4. What is the interest of 121. 188. for one third of a month, at 6 cent.
II. FOR FEDERAL MONEY.
1. Divide the principal by 2, placing the separatrix as usual, and the quotient will be the interest for one month in cents, and decimals of a cent; that is, the figures at the left of the separatrix will be cents, and those on the right, decimals of a cent.
2. Multiply the interest of one month by the given number of months, or months, and decimal parts thereof, or for the days take the even parts of a month, &c.
1. What is the interest of S41 dols. 52 cte.for 71 months ? 2)341,52
Or thus, 170,76 Int. for 1 month. 170,76 Int. for 1 month. X7,5 months.
85580 1195,32 do. for 7 mo. 119532 85,38 do. for ļ mo.
1280,700cts. =12,80 7 1280,70 Ans. 1280,7cts.$12, 80cts. 7m.
2. Required the interest of 10 dols. 44 cts. for 3 years, 5 months and 10 days.
10 days=}) 5,22 Interest for 1 month.
215,76cts. Ans.=82, 15cts. 717. to 8. What is the interest of 342 dollars for 11 months ?
The & is 171 Interest for one month.
Ans. 1881cts. =$18; 81cts, NOTE.-To find the interest of any sum for 2 months, at 6 per cent. you need only call the dollars se many cents, and the inferior denominations decimals of a cent, and it is done : Thus, the interest of 100 dollars for two monthsy is 100 cents, or 1 dollar; and $25, 40 cts. is 25 cts. 4 m. &c. which gives the following
RULE II. Multiply the principal by half the number of months, and the product will shew the interest for the given tiine; in oents and decimala of a cent, as above.