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o-PLE INTER-E-T. lon

3. What is the interest of 5711. 13s. 9d. for one year, at

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FEDERAL MONEY. 5. What is the interest of 468 dols. 45 cts. for one year,

at 6 per cent.” 3 cts. 468, 45 G

Ans. 2810, 70–$28, 10cts. 7 m.

Here I cut of the two right hand integers, which divide by 100: but to divide federal money by 100, you need only ball the dollars so many cents, and the inferior denominaions 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 multiplication affederal money, and all the figures at the left of the sepaoatrix, will be the interest in cents, and the first figure on 'e right will be mills, and the others decimals of a mill, as on the following

---------6. Required the interest of 135 dols, 25cts, for a year at 5 per cent? $ cts. 135, 25 d

Ans. 811, 50–38, 11 cts. 5 m. 7. What is the interest of 19 dols. 51 cts, for one year, at

5 per cent.” 3 cts. 19, 51 5.

Ans. 97, 55–97 cts. 54m. 8. What is the interest of 436 dols, for one year, at 6per cent.” o

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Write down the given principal in cents, which multiply by the rate, and divide by 100 as before, and you will have the interest for a year, in cents, and decimals of a cent, as follows:

9. What is the interest of $73, 65 cents for a year, at 6

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10. Required the interest of $85,45 cts. for a year, at " per cent.”

Cents. Principal 8545 7

Ans. 598, 15 cents, 35,98cts. 13rm.

CASE II

To find the simple interest of any sum of money, for ary number of years, and parts of a year.

GENERAL Rule-1st. Find the interest of the given sum for one year.

2d. Multiply the interest of one yearby the given number of years, and the product will be the answer for that time.

3d. If there be parts of a year, as months and days, work for the * months by the aliquot parts of a year, and for the days by the Rule of Three Direct, or by allowing 30 days to the month, and taking aliquot parts of the same.*

* By allowing the month to be 30 days, and taking aliquot parts thereos, you will have the interest of any ordinary sum sufficiently exact for common use; but if the sum bevery large, youmaysay, As 365 days : is to the interest of one year ; ; so is the given number ol days: to the interest required

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at)0 2. What is the interest of 64 dollars 58 cents for 3 years, months, and 10 days, at 5 per cent.” $64,58 5

322,90 nterest for 1 year in cents, per 3. [Case I. 968,70 do. for 3 years. 4 mo. 3 || 107,63 de for 4 months.

1 mo. 26,90 do. for 1 month. 10 days, 8,96 do. for 10 days.

Ans. 1112,19–1112cts, or § 11, 12c. 11", m. 3. What is the interest of 789 dollars for 2 years, at 6

per cent.” Ans. $94, 68 cos. 4. Of 37 dollars 50 cents for 4 years, at 6 per cent. per

annum ? Ans. 900 cts, or $9. 5. Of 325 dollars 41 cts, for 3 years and 4 months, at 5

percent.” Ans. $54, 23 cos. 5 m.

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112 . COMM-15-1-N.

9. Of I dollar for 12 years, at 5 per cent.” Ans. 60 cas. 10. Of 215 dollars 34 cts, for 4 and a half years, at 4 and a half per cent. Mns. $33, 91 cts, 6m. 11. What is the amount of 324 dollars (51 cents for a years and 5 months, at 6 per cent.” Ans. $430, 10cts. Som. 12. What will 3000l. amount to in 12 years and 10

months, at 6 per cent.” Ans. C5310. 13. What is the interest of 2571. 5s. 1d. for 1 year and 3 quarters, at 4 per cent. 1 Ans. E18 0s. 1d. 34ps.

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. 7am. 15. What will 2791. 13s. Sd. amount to in 3 years and a half, at 5% per cent per annum? - Ans. -Co-1 1s. 6d. 16. What is the amount of 341 dols. 60cts for 5 year. and 3 quarters, at 7 and a half per cent. per annum ? - Ans. $4SS, 911 cts. 17. What will 780 dols, amount to at 6 per cent. in 5 years, 7 months, and 12 days, or os of a year? Ans. $975, 99 cts. 18. What is the interest of 1825l. at 5 per cent, per an: num, from March 4th, 1796, to March 29th, 1799, (allow ing the year to contain 365 days?) Ans. C280.

Note.—The Rules for Simple Interest serve also to calculate Commission, Brokerage, Ensurance, or anything 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. ----------

1. What will the commission of 8431. 10s, come to at to

per-cent. 1

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