30. If for immediate payment Mr. Brown gets 5% deduction from a bill of $31.20, how much does he pay?

31. How must goods that cost 40 cents a yard be sold to gain 5%? 10%? 12% ? 15%? 20% ? 25% ? 30% ? 35%? 40%? 50% ?

32. Of 50 barrels of apples 20% were found to be spoiled, and the rest were good. How many barrels of apples were good?

33. If a man pays $45 for a pair of oxen and sells them for $50, what per cent does he gain?

34. From a cask of 50 gallons of molasses a grocer had sold 5 gallons. What per cent had he sold?

35. What per cent of $50 is $10? $20? $25? $27.50? $35? $50? $75? $100? $150?

36. Of a brood of 9 chickens 3 were killed. What per cent were left alive?

37. A grocer sold tea at 55 cents a pound and thus gained 10%. What did the tea cost him a pound?

38. If a grocer sells tea at 55 cents a pound and thus loses 10%, what did the tea cost him a pound?

39. If a man sells anything at half of its cost, what per cent does he lose?

40. If a man sells anything for twice as much as it cost, what per cent does he gain?

41. What does a man get for an article on which he loses 100% ?

42. What do you say about losing 150% f Gaining 150%?

43. If Mr. Thorndike invests of his money in land, what per cent of it does he so invest ? 44. $50 is 50% of how many dollars? 25% ? 20%? 10%? 61%? 331%? 100% ?

Three

45. What per cent of a number is one fourth of it? Three fourths? One eighth? eighths? Five eighths? Five quarters?

46. A dealer who pays 5% for selling goods paid one of his salesmen for his day's sales $3. How many dollars worth of goods did the latter sell?

47. At 5% what sum can be insured for a premium of $50?

48. Peter spends $0.25, and this is 33% of all he has. How much money has he left?

49. A merchant sends his agent $52.50 from which he is to take his commission of 5% and

expend the rest for sugar. What sum will the agent have to expend?

50. Stephen misspelled 12% of the words given to him and spelled correctly 44 words. How many words were given to him to spell?

51. If 4% of 150 pupils in a school are absent, how many are absent? Can 5% be absent?

52. If of 1550 inhabitants of a town 2% died in a year, how many died? Can 3% die? 53. If I buy a horse for $200 and sell it for $225, what per cent do I gain? What per cent should I lose if I sold it for $160? If the man who bought it for $160 should sell it for $200, what per cent would he gain?

54. What per cent do I gain if I sell for $3 a pair of boots that cost me $2.50 a pair?

55. A merchant bought three cases of goods at $50 a case. He gained 331% on 2 cases and lost 162% on one case. How much was his entire gain? What per cent?

56. If 20% of a cargo of fruit is spoiled, at what per cent of the cost must the rest be sold to gain 20% on the entire cago?

57. A wagon that cost $60 was sold for $48. What per cent was lost? For what price must it have been sold to gain 25% ?

58. Frank sold a knife for a dollar and gained 331% What did the knife cost him?

59. A man bequeathed 333% of an estate of $6000 to his wife, and the remainder, in equal portions, to his four children. How much did each child receive?

CHAPTER XLVIII.

Interest is money paid for the use of money. The rate is the number of hundredths of the sum on which interest is paid for its use for a year, or other specified time.

If no time is specified a year is meant.

1. What is the interest of $100 for 5 years at 4%? For 8 years?

The interest of $100 at 4% for one year is $4: for 5 years, $4 × 5 = $20.

2. What is the interest of $100 for 5

5%? At 6% ? At 8% ?
3. At 6% what is the
months? For 4 months?

years at

At 12% ? At 3% ?

interest of $100 for 6 For 3 months?

4. At 6% what is the interest of $100 for 2 years and 6 months? For 3 years and 4 months? For 6 years and 3 months?

In interest it is customary to reckon 30 days as a month.

5. At 6% what is the interest of $100 for 15 days? For 12 days? For 18 days? For 21 days? For 6 days? For 3 days? For 2 days?

6. What is the interest of $200 for 3 years at 4%? At 3% ? At 7% ? At 8% ?

7. At 6% what is the interest of $100 for 3 months and 12 days? For 7 months and 15 days? For 6 months and 24 days?

8. At 6% what is the interest of $250 for 4 years? For 7 years? For 5 years? For 3 years and 4 months? For 1 year, 8 months, and 12 days? For 2 years and 6 months?

9. The interest of a sum of money for 2 years is $12, and the rate is 6%. What sum of money is on interest? What sum would gain $36 in the same time at the same rate?

10. What is the interest of $50 for 2 years and 6 months at 8%? At 6% ? At 4% ? At 5% ?

11. Find the interest of $1000 for 6 months and 20 days at 6%. At 8%. At 7%. At 4%. At 3%. At 5%. At 9%. At 10%.

12. What is the interest of $48 5%? For 2 years and 6 months?

and 4 months?

for 3 years at

For 3 years

13. How many tons of coal, at $6 a ton, can be bought for the interest of $200 for 3 years, at 4%? At 6%? At 3% ? At 5% ?

14. At 6% what is the interest of $1 for 3 years, 4 months, and 12 days? For 2 years, 6 months, and 18 days?