14. Find the interest of $850 for 2 yr. at 6%. MODEL. 6% = .06. The interest for 2 yr. = $ 51 x 2 = $102 Ans. 15. Find the interest of $600 for 3 yr. at 6%. At 5%. At 52%. 16. Find the interest of $250 for 41 yr. at 5%. At 6%. At 41%. 17. Find the interest of $ 400 for 1 mo. at 6%. 12 yr. MODEL. 1 mo. = 1 x $24 = $2 = interest for 1 mo. 18. Find the interest of $300 for 3 mo. at 6%. At 41%. At 5%. 19. Find the interest of $425 for 5 mo. at 6%. 20. Find the interest of $1000 for 9 mo. at 5%. At 6%. 21. Find the interest of $ 2000 for 10 mo. at 5%. At 6%. LESSON 126 The Amount is the sum of the principal and interest. 1. Find the amount of $ 480 for 2 yr. at 6%. MODEL. $480 x .06 = $28.80 = interest for 1 year. $28.80 x 2 = $57.60 = interest for 2 yr. $480 + $57.60 = $ 537.60, Amount. 2. Find the amount of $400 for 3 yr. at 5%. 4. Find the amount of $ 350 for 31 yr. at 4%. yr. 8 mo. at 6%. By the common method of reckoning interest it is customary to regard 30 days as a month and 360 days as a year. 8. Find the interest of $500 for 3 yr. 5 mo. 15 da. at 6%. MODEL. 15 days = }, or } mo. 5 mo. = 41 mo. $30 - 12 = $2.50 = interest for 1 mo. $600 x .05 = $30 = interest for 1 yr. $30 - 12 = $2.50 = interest for 1 mo. $2.50 x 313 = $79.16} = interest for 2 yr. 7 mo. 20 da. Find the interest of $ 560 for 2 yr. 5 mo. 25 da. at Find the interest of $ 325 for 4 yr. 3 mo. 18 da. at Find the interest of $ 450 for 2 yr. 10 mo. 10 da. at 10. 5%. 11. 4%. 12. 6%. 13. 4%. 14. 5%. Find the interest of $ 725 for 3 yr. 7 mo. 6 da. at Find the interest of $ 840 for 2 yr. 11 mo. 5 da. at REVIEW WORK LESSON 127 1. How many board feet are there in a board 20 ft. long, 12 in. wide, and 2 in. thick ? 2. How many acres are there in a triangular piece of land whose base is 320 yd. and whose altitude is 242 yd. ? 3. Find the value, at $50 an acre, of a triangular field whose base is 16.5 ch. and whose altitude is 14.4 ch. 4. How much is a pile of wood worth at $4f a cord, if the pile is 16 ft. long, 8 ft. wide, and 4 ft. high? 5. When the length, breadth, and depth of a rectangular solid are given, how do you find its volume ? 6. Give the rule for finding the area of a triangle. 7. Find the cost of 33 ft. of wire fencing at $ 1.20 a rod. 8. 331% of 2 sq. yd. equals how many square feet ? 9. 3 sq. yd. is what part of 3 yd. sq. ? 10. Change to decimals and add: 16, 2o, 3o, §, 1. 11. Find the sum of 6.009, .06], .37, 6%. 12. A single roll of wall paper is 24 ft. long and 18 in. wide. How many square yards does it contain ? 13. A double roll of wall paper is 48 ft. long, and 18 in. wide. How many square feet does it contain ? 14. How many double rolls of paper will be needed for a ceiling 18 ft. by 20 ft.? 15. How many strips of ingrain carpet (1 yd. wide) will it take to cover a floor 22 ft. long by 18 ft. .wide, if the carpet is laid crosswise ? How many yards will be needed ? 16. If 21 cans of tomatoes cost $2.52, how much will 7 cans cost? -10 GRAD. ARITH. V. 145 LESSON 128 1. What is the unit in Liquid Measure? How many cubic inches in a gallon ? 2. Allowing 72 gallons to equal one cubic foot, what is the capacity of a 10 gallon keg? 3. If lb. of tea costs $], how many pounds can be bought for $15? 4. A cubic foot of pure water weighs 621 lb. Find the weight of the water that will fill a tin box 2 ft. long, 18 in. wide, and 8 in. deep. 5. What part of an acre is a lot 8 rd. long and 4 rd. wide ? 6. If 4 of the quantity of onions costs $6}, what is the price of the whole quantity ? 7. 25% of a pound = how many ounces? 50% of a rod = how many feet ? 663% of a square foot = how many square inches ? 8. If a man loses 371 % of his money, what % of his money has he left ? How many eighths of his money has he left ? 9. Draw a rectangle 4 in. long and 2 in. wide, and show 75% of it. 10. Which will hold the more, cubical boxes with 5-inch edges, or 5 cubical boxes with 4-inch edges ? 11. Find the perimeter of a rhombus whose edge is 5 ft. 6 in. 12. What is the area of a circle whose radius is 10 ft. ? 13. If I buy lemons at 16¢ a dozen, and sell them at the rate of 3 for 5%, how much is my profit on 150 lemons ? LESSON 129 1. How many gills are there in 8 gal. 2 qt. 1 pt. 2 gi. ? 2. What is the value of a pile of wood 96 ft. long, 4 ft. wide, and 6 ft. high, at $3a cord ? 3. If 56 men can do a piece of work in 21 days, how long will it take 28 men to do it? 4. A butcher bought a number of sheep for $1040, and sold them for $ 1430. If he gained $1.50 on each sheep, how many did he buy? 5. Divide 8763} by 22. 6. If 5} tons of coal cost $32, how much will 3.663 tons cost? 7. How many board feet are there in a board 18.25 ft. long, 2.8 ft. wide, and 1 in. thick ? 8. Divide 94.5 by .126. Multiply .039 by .0009. 9. I bought a quantity of grain for $500, and sold it at a loss of 5%. How much did I receive for it? 10. A farmer sold of his potatoes at one time, and } at another, and had 48 bu. left. How many bushels had he at first? 11. If .75 of a ton of straw is worth $13.50, how much are 8.25 tons worth ? 12. Find the perimeter of a rectangle 8.1 ft. long and 6 in. wide. Find the area. 13. What is the least common multiple of 7 and 6 ? 14. Name three numbers of which 7 is the greatest common divisor. |