EXAMPLES. 1. What is the interest of 751. 8s. 4d. for 5 years and 2 months, at 61. per cent. per annum ? L. s. d. 4:52 13 0 20 10/50 12 f. s. a. 62no.4 10 6 Interest for 1 year. 5 22 12 6 do. for 5 years. 0 15 1 do. for 2 months. £23 77 Ans. 6100 2. What is the interest of 64 dollars 58 cents, for 3 years, 5 months, and ten days at 5 per cent. ? $64,58 5 322,90 Interest for 1 year in certs, per Case I 3 968,70 do. for 3 years. Ans. 1112,19=1112cts. or $!1, 12c. 18m. 3. What is the interest of 789 dollars for 2 years, at 6 per cent. Ans. 894. 6sets, 4. Of 37 dollars 50 cents, for per amum? 5 Of 325 dollars 41 cts. for 3 5 per cent.? 6. Of 325l. 12s. 3d. for 5 years 4 years, at 6 per cent. Åns. 900ts. or $9. years and 4 months, at Ans. 854, Bets. 5m. at 6 per cent. ? Aus. £97 13s. Sd. half years at 6 per Ans. £.36 138. and 7 months, at 6 Ans. £41 9s. 7d... 7. Of 174l. 10s. 6d. for 3 and a cent. ? 8. Of 150l. 16s. 8d. for 4 years per cent. ? 9. Of 1 dollar for 12 years at 5 per cent.? Ans. 60cts. 10. Of 215 dollars $4 cts. for 4 and a half years, at $ and a half per cent.? Ans. $33, 9icts. 6m. 11. What is the amount of S24 dollars, 61 cents, for 5 years and 5 months, at 6 per cent. ? Ans. $430, 10cts. 835m. 12. What will 3000l. amount to in 12 years and 10 months, at 6 per cent. ? Ans. £5310. 13. What is the inter est of 257l. 5s. 1d. for 1 year and 3 quarters, at 4 per cent. ? Ans. £18 Os. 1d. Sqrs. 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 54 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, 914cts. 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, 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 F) Ans. £280. NOTE.-The Rules for Simple Interest serve also to calculate Commission, Brokerage, Insurance, 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 843 10s. come to at er cent. ? £. s. 843 10 5 42 17 10 20 $150 per cent.? 3. What may a factor demand on son, for laying out 3568 dollars? 6,00 £42 $s. 6d. 2. Required the commission on 964 dols. 90 ets. at 24 Ans. $21. Vers: 13 per cent. comm.ise Ans. $62, 44cts £.. s. d. 750 8 4 BROKERAGE, IS an allowance of so much per cent. to persons agcistang merchants, or factors, in purchasing or selling goods. EXAMPLES. 1. What is the brokerage of 750l. 83. 4d. at 69. 8d. per cent. ? Or thus, £. s. 5 is)843 10: Ans. £42 3.6. Here I first find the brokerage at 1 pound per cent. and then for the given rate, which is 4 of a pound. 3 7,50 8 4 10.08 Q & A 1,00 s. d. £. s. d. grs. 3)7 10 1 Ans. £ 100!} 2. What is the brokerage upon 4125 dols. at 3 or 75 cents per cent. ? Ans. $50. 93ets. 74m. 3. If a broker sells goods to the amount of 5000 dols. what is his demand at 65 cts. per cent.? Ans $32, 50c 4. What may a broker demand, when he sells goods to the value of 508l. 17s. 10d. and I allow him 1 per cent P Ans. £7 12s. 8d. INSURANCE, IS a premium at so much per cent. allowed to personṣ and offices, for making good the loss of ships, houses, merchandize, &c. which may happen from storms, fire, &c. EXAMPLES. 1. What is the insurance of 7251. 8s. 10d. at 121 per cent. ? Ans. £90 13s. 74d. 2. What is the insurance of an East-India ship and cargo, valued at 123425 dollars, at 154 per cent. ? Ans. $19130, 87cts. 5m. 3. A man's house estimated at 3500 dollars, was insu red against fire, for 13 per cent. a year: what insurance did he annually pay? Ans. $61, 25cts. SHORT PRACTICAL RULES, For calculating Interest at 6 per cent. either for months, or months and days. I. FOR STERLING MONEY. RULE. 1. If the principal consists 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 consists 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 shew the interest for one month, in shillings, and decimals of a shilling. EXAMPLES. 1. Required the interest of 54l. for seven months and days, at 6 per cent S. 10 days=4)5,4 Interest for one month. £. s. 7 37,8 ditto for 7 months. Ans. 39,6 shillings-£1 19s. 7,2d. 12 7,2 2. What is the interest of 421. 10s. for 11 months, at 6 cent.? per £• 42,5 decimal value. Therefore 4,25 shillings interest for 1 month. 11 £. s. d. Ans. 46,75 Interest for 11 mo. 3. Required the interest of 941. 7s. 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 12l. 18s. for one third of a month, at 6 per cent. F Ans. 5,16d. 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 months, or months, and decimal parts thereof, or for the days take the even parts of a month, &c. |