EXAMPLES. 1. What is the interest of 751. 8s. 4d. for 5 years and 2 months, at 67. per cent. per annum? £. s. d. 62 mo. 1)4 10 6 Interest for 1 year. £. s. 75 8 d. 4 5 600 2. What is the interest of 64 dollars 58 cents for 3 years, 5 months, and 10 days, at 5 per cent. ? $ 64,58 Ans. 1112,19-1112cts. or $11, 12c. 15m. 3. What is the interest of 789 dollars for 2 years, at 6 Ans. $94, 68 cts. per cent. ? 4. Of 37 dollars 50 cents for 4 years, at 6 per cent. per Ans. 900 cts. or $9. annum ? 5. Of 325 dollars 41 cts. for 3 years and 4 months, at 5 Ans. $54, 23 cts. 5 m. per cent.? 6. Of 57. 12s. 3d. for five years, at 6 per cent.? Ans. £97 13s. 8d. per 7. Of 1.47. 10s. 6d. for 3 and a half years, at 6 cent.? Ans. £36 13s. £8. Of 1507, 16s. 8d. for 4 years and 7 months, at 6 per cent.? Ans. £41 9s. 7d. 9. Of 1 dollar for 12 years, at 5 per cent.? Ans. 60 cts. 10. Of 215 dollars 34 cts. for 4 and a half years, at 1 and a half per cent. Ans. $33, 91 cts. 6m. 11. What is the amount of 324 dollars 61 cents for years and 5 months, at 6 per cent.? Ans. $430, 10 cts. 875m. I 12. What will 30007, amount to in 12 years and 10 months, at 6 per cent.? 3 quarters, at 4 per cent.? Ans. £5310. 13. What is the interest of 2571. 5s. 1d. for 1 year and Ans. £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, 97cts. 74m. 15. What will 2791, 13s. 8d. amount to in 3 years and a half, at 51 per cent. per annum? Ans. £331 1s. 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 of a year? Ans. $975, 99 cts. 18. What is the interest of 18257. at 5 per cent. per annum, from March 4th, 1796, to March 29th, 1799, (allow ing the year to contain 365 days?) Ans. £280. NOTE.-The Rules for Simple Interest serve also to calculate Commission, Brokerage, Ensurance, or any thing else estimated at a rate per cent. COMMISSION, IS an allowance of so much per cent., to a factor or correspondent abroad, for buying and selling goods for his employer. EXAMPLES. 1. What will the commission of 8431. 10s. come to at 5 per cent. ? 600 £42 3s. 6d, 2. Required the commission on 964 dols. 90 cts. at 21 per cent.? Ans. $21, 71 cts. 3. What may a factor demand on 13 per cent. commission for laying out 3568 dollars? Ans. $62, 44 cts. 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 7507. 8s. 4d. at 6s. 8d. per cent. ? Here I first find the brokerage at 1 pound per cent. and then for the given rate, which is of a pound. 1,00 2. What is the brokerage upon 4125 dols. at 3 or 75 cents Ans. $30, 93 cts. 71⁄2 m. amount of 5000 dollars, cent.? Ans. $32, 50 cts. 4. What may a broker demand, when he sells goods to the value of 5087. 17s. 10d. and I allow him 1 per cent. 7 Ans. £7 12s. 8d. ENSURANCE, IS a premium at so much per cent. allowed to persons and offices, for making good the loss of ships, houses, merchandise, &c. which may happen from storms, fire, &c. EXAMPLES. 1. What is the ensurance of 7251. 8s. 10d. at 12 per cent.? Ans. £90 13s. 7ąd. 2. What is the ensurance of an East-India ship and ca go, valued at 123425 dollars, at 15 per cent.? Ans. $19130, 87 cts. 5 m. 3. A man's house estimated at 3500 dols., was ensured against fire, for 13 per cent. a year: what ensurance did he annually pay? Ans. $61, 25 cts. Short Practical Rules for calculating Interest at 6 per cent. either for months, or months and days. 1. FOR STERLING MONEY. RULE.-1. If the principal consist of pounds only, cut off the unit figure, and as it then stands it will be the interest for one month, in shillings and decimal parts. 2. If the principal consist of pounds, shillings, &c. reduce it to its decimal value; then remove the decimal point one place, or figure, further towards the left hand, and as the decimal then stands, it will show the interest for one month in shillings and decimals of a shil. ling. EXAMPLES. 1. Required the interest of 547. for seven months and ten days, at 6 per cent. 2. What is the interest of 427. 10s. for 11 months, at 6 per cent. ? £. S. £. 42 10 42,5 decimal value. Therefore 4,25 shillings interest for 1 month. 11 Ans. 46,75 Interest for 11 mo. — 2 6 9 3. Required the interest of 947. 78. 6d. for one year, five months and a half, at 6 per cent. per annum? Ans. £8 5s. 1d. 3,5grs. 4. What is the interest of 121. 188. for one third of a month, at 6 Ans. 5,16d. per cent.? II. FOR FEDERAL MONEY. RULE.-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 Kaonths, or months and decimal parts thereof, or for the days take the even parts of a month, |