9. What is the interest of 571l. 13s. 9d. for one year, al. per cent. Ans. £ 54 6s. Ojd. 4. What is the interest of 21. 128. 9d. for a year, at Ans. £0 Ss. 2d. 6l. per cent. FEDERAL MONEY. 5. What is the interest of 468 dols. 45 cts. for one e year at 6 per cent. ? $ cts. 468, 45 6 28;10, 70=828, 10cts. 7m. Ans. Here I cut off the two right hand integers, which di vide by 100: but to divide federal money by 190, you need only call the dollars so many cents, and the inferior denominations decimals of a cent, and it is done. Therefore you may multiply the principal by the rate, and place the separatrix in the product, as in inultiplication of federal money, and all the figures at the left of the separatrix, will be the interest in cents, and the first figure on the right will be mills, and the others decimals of a mill, as in the following EXAMPLES. 6. Required the interest of 135 dols. 25 cts. for a year at 6 per cent. Scts, 135, 25 6 811, 5088, 11cts. 5m. Ans. 7. What is the interest of 19 dollars 51 cents for one year at 5 per ceat. ? $ cts 19, 51 5 97, 55=97cts. 5fm. Ans. 8. What is the interest of 436 dollars for one yoar, at 6 per cent. : 6 ms, 261 6éts. $26, 10ets. ANOTHER METHOD. Write down the given principal in cents, which multiply by the rate, and divide by 100 as before, and hivo Elie in orest fur a year, in cents, and decimals of a cerit, is kollows: you will O per cent. 9. What is the interest of 873, 65 cents for a year, at Principal 7565 cents. 6 Ars. 4+1,90cts.=4417rts. Or Si, 41cts. 9m. 10. Required the interest of $85, ficts. for a year, at 7 per cent. : l'ents. Principal 8545 Ans. 598, 15 cents,=85,98cts. 13m. CASE II. To find the simple interest of any suin of money, for any number of years, ane parts of a year. GENERAL ROLE. Ist. Finci the interest of the given surn for one year. 21. Multiply the interest of one year by the giver number of years, and the product will be the alo-wer for that time. 3d. It there be parts of a vear, as month, and dars, work for the months by the aliquot parts of a vear, and for the days by the Rule of Three Direct, or by allowing 30 days lü the month, and taking aliquot parts of the same. * * By allowing the month to toe so dara, and inking aliquot paits thereof, you will have the incrrest of ar y orular y simu suflici.ntly exact for con.mon use; but if ine suin be very large, you may say, As 360 days : is to the interest of one year : : so is the miven number of days : to the interest recuired. EXAMPLES. 1. What is the interest of 751. 8s. 4d. for 5 years and 2 months, at 6l. per cent. per annum ? 6 f. s. a. 5 4:52 130 20 22 12 6 Jo. for 5 years. 10150 12 £23 77 Ans. 6100 2. What is the interest of 64 dollars 58 cents, for 3 years, 3 inonths, and ten days at 5 per cent. ? 64,58 5 per cerit. : 322,90 Interest for 1 year in certs, per 3 Case 1. 968,70 do. for 3 years. 4 mo. } 107,63 du. for 4 imor:tis. 1 mai, 26,90 din. for 1 month. 10 days, } 8,96 elo. für 10 days. Ans. 1112,19=1112els. or S!1, 12c. 116 m. 3. What is the interest of 789 dollars for 2 years. at 6 lus. $94. 6811s. 4. Op 37 dollars 50 cents, for 4 years, at u per cent. this. 900). 15. or $9. 5 Or 3:25 dollars 41 cts. for 3 years and tandlis, at 5 .per cent. dis. Söt, 2:30ts. 5m. 6. Of 325l. 123. 3d. for 5 Ans. 6.97 135. Sul. 7. OF 1741. 10s. 6d. for 3 and a half years at 6 per cent. : Ins. (56 1.38. 8. Of 1501. 16s. 8d. for 4 years and 7 months, at 6 Ans. 641 9s. 7d. per aur.liiu : yeau's at 6 per centi per cent. ? year and 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 s 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. 876 m. 12. Wisat will 30001. amount to in 12 years and 10 months, at 6 per cent. ? Ans. £5310. 13. What is the interest of 2571. 58. 1d. for 1 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. 848, 97 cts. 71m. 15. What will 2791. 135. 8d. amount to in 3 a half at 51 per cent. ? years and Ans. £ 531 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. Ans. $488, 91fcts. 17. What will 730 dols. amount to at 6 per cent. in 5 years, 7 months and 12 days, or is of a year ? Ans. $975, 99cts. 18. What is the interest of 1825l. at 5 per cent. per andum, 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 per cent. per annum? 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 per conta 6,00 £42 $s. 6d. £. Required the commission on 964 vols. 90 ets. at % Ans. Scrs: 3. What may a factor demand on li per cent. eomnise son, for laying out 356.8 duliers : ins. 862, 4401 Det ceint.? BROKERIGE, IS an allowance of so much per cent. to persons assist: ang merchants, or factors, in purchasing or sellir:good so EXAMPLES. 1. What is the brokerage of 7501. 83. 4d. at 6%. Nd. per cent. ? 750 8 Here I first find the brokerage at 1 pound per cent. and then for the given rate, which is į of a pound. 7,50 8 4 10.08 12 Ans. Le 100!} 1,00 2. What is the brokerage upon 4125 dols. at 3 or 75 cents per cent.. Ans. $50, 93ets.m. 3. If a broker sells goods to the amount of 5000 dula what is his demand at 65 cts. per cent. Ins 832, 30ckse |