Εικόνες σελίδας
PDF

ANOTHER METHOD. 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 certs for a year, at 6 per cent. ?

Principal 7365 cents.

Ans. 441,90=44137 cts. or $4, 41 cts. 9 m. 10. Required the interest of $85, 45 cts. for a year, at ? per cent. ?

Cents.
Principal 8545

[ocr errors][merged small]

To find the simple interest of any sum of money, for asy

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 year by the given number of years, and the product will be the answer for that timo.

3d. Ifihere be parts of a year, as months and days, work for tho months by the aliquot parts of a year, and for the days by the Rule of Threo 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 thereof, you will have thc intcrest of any ordinary sum sufficiently exact for common use ; but is the sum be very large, you may say,

As 365 days : is to the intercst or one year : : 80 is the given number of days : to the interest required

EXAMPLES. 1. What is the interest of 751. 8s. 4d. for 5 years and 2 months, at 61. per cent. per annum?

£. $. d. 275 8 4

£. s. d.
6 2 mo.=")4 10 6 Interest for 1 year.

[ocr errors]
[ocr errors]

4152 10 0 20

22 12 6 do. 5 years.

0 15 1 do. for two months. 10250 12

£23 77 Ans. 600

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

(Case I.

[merged small][merged small][ocr errors]

9. Of I dollar for 12 years, at 5 per cent. ?

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

Ans. $33, 91 cts. Om. 11. What is the amount of 324 dollars 61 cents for years and 5 months, at 6 per cent. ?

Ans. $430, 10 cts. 82.6. m. 12. What will 30001. amount to in 12 years and IC months, at 6 per cent.?.

Ans. £5310. 13. What is the interest of 2571. 5s. 1d. for 1 year ano 3 quarters, at 4 per cent. ? Ans. £18 Os. lll. 3yrs.

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 arnum?

Ans. £33l ls. 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 18251. at 5 per cent. per an. num, from March 4th, 1796, to March 29th, 1799, (allow ing the year to convain 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 8 per cent. ?

[ocr errors][ocr errors][merged small][merged small][merged small]

6100

£42 3s. 6d. 4 Required the commission on 964 dols. 90 cts. at 24 per vent. ?

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

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

EXAMPLES. 1. What is the brokerage of 7501. 8s. 4d. at 6s. 80. per cent. ?

£ s. d. 750 8 4 Here I first find the brokerage at 1 pound

per cent. and then for the given rate,

which is of a pound. 7,50 54

s. d. £. s. d. grs.

6 8=)7 10 10
10,08
12

Ans. £2 10 0 li 1,00 2. What is the brokerage upon 4125 dols. at or 75 cents per cent. ?

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 cts.

20

[ocr errors]

4. What may a broker demand, when he sells goods to the value of 5081. 175. 100. and I allow himn l} per cent. I

Ans. £7 12s. 8d.

ENSURANCE,

IS a premium at so much per cent. ailowed to persons and offices, for making good the loss of ships, hruses, mer. chandise, &c. which may happen from storms, fire, &c.

· EXAMPLES.

1. What is the ensurance of 7251. 8s. 10d. at 124 pci* cent. ?

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

Ans. $19130, 87 cts. 5 m. 3. A man's house estimated at 3500 dols., was ensureid 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 inierest 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.

liny.

EXAMPLES.

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

« ΠροηγούμενηΣυνέχεια »