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CHAPTER XLIX.

THE sum of money put at interest is called the principal.

The amount is the sum of the principal and interest.

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1. What is the amount of $100 on interest for years and 6 months, at 6% ?

2. What is the amount of $500 for 2 years at 8%? For 3 years? For 5 years?

3. What is the amount of $300 for 3 years and 4 months, at 6%? At 8% ? At 5%? At 4% ? 4. If the amount of a sum of money, on interest for 2 years, is $108, and the rate is 4%, what is the principal? What interest does the principal gain in 3 months? What is the amount for 2 years and 6 months?

5. Find the amount of $1000 for 6 years and 8 months, at 6%. For 3 years and 6 months. For years. For 4 years.

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6. If the interest of a sum of money is $0.96 a month, what is the interest for 10 days? For 5 days? For 15 days? For 25 days? For 21 days? For 30 days? For 45 days?

CHAPTER L.

1. A sum of money on interest for 5 years at 4% amounted to $600. What was the principal? 2. One hundred dollars amounts to $124 at 6%. How long was it on interest?

3. At 4%, in what time will $100 gain $10?

4. How long will it take $200 at 6% to gain $60? To gain $10? To gain $15? To gain $1? To gain $200 ?

5. How many years, at 6%, will it take any sum to gain a sum equal to itself? At 5%? At 8%? At 10% ?

6. What part of itself will any sum gain in two months at 6%? In one month? In one day?

7. At 6% what is the interest of $300 for 8 years and 4 months? For 4 years and 2 months? For 6 years and 8 months?

8. At 6%, what is the interest of $200 for 3 months and 10 days? For 90 days?

9. At 6%, what is the interest of $100 for 2 years, 6 months, and 15 days?

10. At 4%, what is the interest of $120 for 4 years, 6 months? At 5%? At 8%? At 3%? At 7%? At 10% ?

CHAPTER LI.

FROM Some of the examples in the preceding three chapters the pupil may have noticed that at 6% any sum of money in 2 months, that is, of a year, will gain 1%, or 0.01 of itself. In other words to find the interest at 6% of any sum of money for 2 months, we take of the sum, that is, we move the decimal point two places to the left. Thus the interest of $25 for 2 months is $0.25.

1. At 6% find the interest for 2 months of

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2. At 6% find the interest for 1 month of

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3. At 6% find the interest for 4 months of

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4. At 6% find the interest for 10 months of

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As 6 days is

of 60 days (2 months) for 6

days at 6% any sum of money will gain of 1%, or 0.001 of itself. In other words to find the interest of any sum of money at 6% for 6 days, we take of the sum, that is, we move the decimal point three places to the left. Thus the interest of $20 for 6 days is $0.02.

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6. At 6% find the interest for 12 days of

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7. At 6% find the interest for 18 days of

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8. At 6% find the interest for 24 days of

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