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EXAMPLES.

S.

.

1. What is the interest of 75l. 8s. 4d. for 5 years and 2 months, at 6l. per cent. per annum ?

£. d.
75 8 4

£. s. d.
62 mo.=)4 10 6 Interest for 1 year.

5
4152 10

0 20

22 12 6 do. 5 years.

0 15 1 do. for two months.
10250
12

£23 77 Ans.

6100
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.

per cent. ?

968,70 do. for 3 years. 4 mo.

107,63 do. 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. 14om. 3. What is the interest of 789 dollars for 2 years, at 6

Ans. $94, 68 cts. 4. Of 37 dollars 50 cents for 4 years, at 6 per cent. per annum?

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

Ans. $54, 23 cts. 5 m. 6. Of:51. 12s. 3d. for five years, at 6 per cent. ?

Ans. £97 13s. 8d. 7. Of 1.41. 10s. 6d. for 3 and a half years, at 6 per cent.?

Ans. £36 13s. 8. Ox 1501. 16s. Bd. for 4 years and 7 months, at 6 per cent, ?

Ans, £41 9s, 7d.

per cent. ?

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9. Of I dullar for 12 years, at 5 per

cent. ?

Ans. 60 cts. 10. Of 215 dollars 34 cts. for 4 and a half years, at 3 and a half per cent.

Ans. $33, 91 cts. 6m. 11. What is the amount of 324 dollars 01 cents for : years and 5 months, at 6 per cent. ?

Ans. $ 130, 10 cts. 8-om. 12. What will 30001, amount to in 12 years and 10 months, at 6

per
cent. ?

Ans. .£5310. 13. What is the interest of 2571, 5s. ld. for 1 year and 3 quarters, at 4 per cent. ? 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. 7m. 15. What will 2791. 13s. 8d. amount to in 3 years and a half, at 51 per cent. per

annum?

Ans. £331 ls. Od. 16. What is the amount of 311 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 14 of a year?

Ans. $975, 99 cts. 18. What is the interest of 18251. at 5 per cent. per ans num, 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.

1 2 36 3

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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 6 ver cent, ?

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6100 £42 3s. 6d. 2. Required the commission on 964 dols. 90 cts. at 21 per went. ?

Ans. $21, 71 cts. 3. What may a factor demand on 17 per cent. commission for laying out 3568 dollars ? Ans. $62, 44 cts.

BROKERAGE, IS an allowance of so much per cent. to persons assistmig merchants, or factors, in purchasing or selling goods.

EXAMPLES.

1. What is the brokerage of 7507. 8s. 4d. at 6s. 8d. per cent. ?

£ s. d.
750 84 Here I first find the brokerage at 1 pound
1 per cent. and then for the given rate,

which is į of a pound.
7,50 94
20

6 8=)7 10 1 0
10,08
12

Ans. £2 10 0 1}

s. d.

£. s. d. qrs.

per cent. ?

1,00 2. What is the brokerage upon 4125 dols. at for 75 cents

Ans. $30, 93 cts. 71 m. 3. If a broker sell goods to the amount of 5000 dollars, what is his demand at 65 cts. per cent. ?

Ans. $32, 50 ct

4. What inny a broker demand, when he sells goods to the value of 508l. 17s. 10d. and I allow him 1} per cont. I

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, mer. chandise, &c. which may happen from storms, fire, &c.

EXAMPLES.

1. What is the ensurance of 7251. 8s. 10d. at 121 pei cent. ?

Ans. £90 13s. 7 d. 2. What is the ensurance of an East-India ship and care go, valued at 123425 dollars, at 15 per cent. ?

Ars. $19130, 87 cts. 5 m. 3. A man's house estimated at 3500 dols., was ensured against fire, for 1 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 sliillings 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 morth in shillings and decimals of a stil ling.

EXAMPLES.

1. Required the interest of 541. for seven months and ten days, at 6 per cent.

S.

10 days=})5,4 Interest for one month.

7

37,8 ditto for 7 months.

1,8 ditto for 10 days.
Ans. 39,6 shillings=£1 19s. 7,2d.

12

7,2

2. What is the interest of 421. 10s. for 11 months, it 6

per cent. ?

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£.

£.
42 10 42,5 decimal value.
Therefore 4,25 shillings interest for 1 month.
11

£.
Ans. 46,75 Interest for 11 mo. = 2 6

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d. 9

3. Required the interest of 941. 7s. 6d. for one year, five months and a half, at 6 per cent. per annum ?

Ans. £5s. Id. 3,5qrs.

4. What is the interest of 121. 18y. for one third of a month, at 6 per cent. ?

Ans. 5,16d.

II. FOR FEDERAL MONEY.

Rule.-1. Divide the principal by 2, placing the separatrix as usual, ad the quotient will be the interest for one month in cents, and decia mals of a cent; that is, the figures at the left of the separatrix will be cents, and those on the right, docimals 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, ki

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