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3. What is the interest of 500L. for one year, at 6L.

per cent. per annum?

Ans. 30L.

4. What is the interest of 1000L. for one year, at 7L. Ans. 70L.

per cent. per annum?

5. What is the interest of 350L. 17s. 8d. for one year, at 6L. per cent. per annum? Ans. 21L. 1s. Od. 6. What is the interest of 220L. for one year, at 4L. Ans. 8L. 16s.

per cent. per annum?

7. What is the interest of 76L. for one year, at 5L. per cent. per annum?

Ans. 3L. 16s.

8. What is the interest of 270L. 10s. 6d. for one year, at 5L. per cent. per annum? Ans. 13L. 10s. 6d. 9. What is the interest of 542 dollars for one year, Ans. $32.52.

at 6 dollars per cent. per annum?

542
6

$32.52

10. What is the interest of 756 dollars for one year,

at 7 dollars per cent. per annum?

Ans. $52.92.

11. What is the interest of 600 dollars for one year,

Ans. $30.00.

12. What is the interest of $438.25 for one year, at 6

at 5 dollars per cent. per annum?

dollars per cent. per annum?

Ans. 26dols. 29cts. 5m. or $26.294.

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13. What is the interest of $322.71 for one year, at

14. What is the interest of $75.95 for one year, at 7

5 dollars per cent. per annum?

dollars per cent. per annum?

Ans. $16.13.

Ans. $5.31+

Note.-When the amount is required, add the prin

cipal to the interest.

15. What is the amount of 173L. 17s. 81⁄2d. for one year, at 7L. per cent. per annum?

Ans. 186L. Is. 14d.

16. What is the amount of a bond, for 756 dollars, for one year, at 6 dollars per cent. per annum?

CASE 2.

Ans. $801.36.

When there is a fraction, as 4, 4, 4, &c. in the rate

per cent.

RULE.

Multiply the principal by the pounds or dollars of the rate per cent.; to the product add,, or, &c. of said principal, and divide the result by 100, as in the foregoing case.

EXAMPLES.

1. What is the interest of 432L. 10s. for one year, at 5 L. per cent. per annum?

Ans. 23L. 15s. 9d.

2. What is the interest of 428 dollars for one year, at 64 dollars per cent. per annum?

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Ans. $26.75.

(2) Dols. 4|428

64

2568
107

$26.75

3. What is the interest of 216L. 5s. for one year, at 5L. per cent. per annum?

Ans. 11L. 17s. 10 d.

4. What is the interest of 500L. for one year at 64L. per cent. per annum? Ans. 31L. 5s. 5. What is the interest of 855L. 17s. 6d. for one year, at 5L. per cent. per annum?

Ans. 49L. 4s. 3d.

6. What is the interest of 300 dollars for one year, at

64 dollars per cent. per annum?

CASE 3.

Ans. $18.75.

To find the interest when the time is two or more

years.

RULE.

Find the interest of the given sum, for 1 year: then, multiply the interest for 1 year, by the number of years given.

PROOF.

By the Double Rule of Three.

EXAMPLES.

1. What is the interest of 700L. 16s. 8d. for 5 years,

at 6L. per cent. per annum?
L.
d.
700 16 8

S.

Ans. 210L. 5s.

L.

S.

Interest for 1 year 42 1

6

5

Interest for 5 years 210 5

42/05 0 0
20

1/00

i

2. What is the interest of 750L. for 3 years, at 6L.

per cent. per annum?

Ans. 135L.

3. What is the interest of 375L. 10s. 6d. for 4 years, at 7L. per cent. per annum?

Ans. 105L. 2s. 11d.

4. What is the interest of 353L. 6s. 3d. for 9 years, at 5L. per cent. per annum?

Ans. 158L. 19s. 94d.

5. What is the interest of $438.25 for 5 years at 6

dollars per cent. per annum?

Ans. $131.47.

6. What is the interest of 1000L. for 4 years, at 64L.

per cent. per annum?

Ans. 250L.

7. What is the interest of 1711L. 15s. for 2 years,

at 5L. per cent. per annum?

Ans. 196L. 17s.

8. What is the interest of 320 dollars for 6 years, at

51⁄2 dollars per cent. per annum?

Ans. $105.60.

9. What is the amount of 720L. for 3 years, at 6L.

per cent. per annum?

Ans. 849L. 12s.

10. On a mortgage for 1256 dollars there is 4 years interest due, at 6 dollars per cent. per annum, which is to be paid with the principal; what sum will discharge the debt? Ans. $1557.44.

CASE 4.

To find the interest when the given time is months, weeks, or days, less or more than a year.

RULE.

Find the interest of the given sum for one year, then,

As one year

Is to the given time

So is the interest of the given sum for one year,

To the interest required.

Or, take parts of the yearly interest for the aliquot

K

parts of a year that are in the given time, and add the interest for the odd days (if any) found by the Rule of Three.

EXAMPLES.

1. What is the interest of 350L. for 3 years and 10 months, at 6L. per cent. per annum?

Ans. 80L. 10s.

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2. What is the interest of 150L. 19s. for 3 years and 4 months, at 6L. per cent. per annum?

Ans. 30L. 3s. 9d.

3. What is the interest of 57L. 17s. 8d. for 3 months, 17s. 44d.

at 6L. per cent. per annum?

4. What is the interest of 7500 dollars for 4 months,

at 7 dollars per cent. per annum? 5. What is t

Ans. $175.00.

is the interest of 400L. for 1 week, at 5L.

per cent. per annum?

Ans. 7s. 84d. +

6. What is the interest of 126L. 12s. for 16 weeks, at

41⁄2 per cent. per annum?

IL. 15s. Od. +

7. What is the interest of 250L. for 73 days, at 7L.

per cent. per annum?

Ans. 3L. 10s.

8. What is the interest of 500L. for 146 days, at 6L.

per cent. per annum?

Ans. 12L.

9. What is the interest of 71L. 3s. 11 d. for 1 year,

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