LESSON 123 1. How many board feet equal a cubic foot? 2. How many board feet are there in a board 12 ft. long, 1 ft. wide, and 2 in. thick? How many cubic feet? 3. A board 6 ft. long, 1 ft. wide, and 1 in. thick is what part of a cubic foot? 4. How many board feet are there in a board 8 ft. long, 1 ft wide, and 11⁄2 in. thick ? 5. How many board feet are there in a board 10 ft. long, 1 ft. wide, and 2 in. thick? 6. How many cubic feet are there in a board 16 ft. long, 1 ft. wide, and 1 in. thick? 7. How many board feet equal 4 cubic feet? 6 cubic feet? 8. 5 cubic feet equal how many board feet? 9. How many board feet are there in a board 18 in. wide and 12 ft. long? 10. How many board feet are there in a board 15 in. wide, 16 ft. long, and 1 in. thick? In a board 15 in. wide, 20 ft. long, and 1 in. thick? 11. Find the number of cords in a pile of wood 32 ft. long, 8 ft. high, and 4 ft. wide. Find the cost of the wood at $5.60 a cord. 12. How many board feet are there in 12 boards, each 16 ft. long, 1 ft. wide, and 1 in. thick? 13. Find the number of board feet in 25 boards, each 12 ft. long, 18 in. wide, and 1 in. thick. 14. Find the cords in a pile of wood 40 ft. long, 12 ft. high, and 41 ft. wide. INTEREST LESSON 124 If you use land or a house belonging to another person, the money you pay for the privilege is called rent. If you obtain the use of another's money, the sum you pay for its use is called Interest. The money loaned is called the Principal. Interest is always calculated at a certain per cent of the principal for one year, unless otherwise stated. For example, interest at 6% means that the interest for one year is 6% of the principal. Interest at 5% means that the interest for one year is 5% of the principal. If I borrow $1 for a year and agree to pay 6% interest, I must pay 6% of $1.00, or 18 of $1.00, or 6 interest. 1. If I pay 6 for the use of $1 for 1 year, how much interest must I pay if I keep it 2 yr.? 3 yr.? 4 yr.? 51 yr.? 2. If the interest of $1 for 1 yr. is 64, how much is the interest of $5 for a year? 2 yr.? 3 yr.? 41 yr.? 3. If the interest of $1 for 1 yr. is 64, how much is the interest of $10? $12? $21? 4. At 4%, what is the interest of $1 for 1 yr.? 2 yr.? 3 yr.? 3 yr.? 5. At 6%, what is the interest of $4 for 1 yr.? 3 yr.? 21 yr.? 6. What is 6% of $100? $200? $300? $250 ? 7. What is the interest of $100 for 1 yr. at 6%? For 2 yr.? For 6 mo. (yr.)? 8. What is the interest of $1 for 1 yr. at 5%? For 2 yr.? For 6 mo.? 9. At 5%, how many dollars must I lend to receive 50 interest at the end of a year? 10. At 7%, how many dollars must be on interest to yield $1.40 interest? LESSON 125 1. What is the interest of $40 for 3 yr. at 5%? The interest for 3 yr. = 3 times $2, or $6. 2. Find the interest of $60 for 4 yr. at 5%. 3. Find the interest of $80 for 3 yr. at 5%. 4. Find the interest of $75 for 2 yr. at 4%. 5. Find the interest of $100 for 3 yr. at 4%. 6. Find the interest of $200 for 4 yr. at 4%. 7. Find the interest of $100 for 2 yr. at 6%. 8. Find the interest of $300 for 3 yr. at 6%. 9. Find the interest of $200 for 3 yr. 6 mo. (31 yr.) at 6%. 10. Find the interest of $200 for 2 yr. 8 mo. (23 yr.) at 6%. 11. Find the interest of $200 for 2 yr. 9 mo. (23 yr.) at 6%. 12. What is the interest of $800 for 1 yr. at 4%? At 5%? At 3%? 13. What is the interest of $600 for For 2 yr. 4 mo.? For 2 yr. 8 mo.? (2 yr.)? 2 yr. 6 mo. at 3%? For 2 yr. 10 mo. 14. Find the interest of $850 for 2 yr. at 6%. MODEL. 6% = .06. The interest for 1 yr. = $850 × .06 = $51. The interest for 2 yr. = $51 × 2 = $102 Ans. 15. Find the interest of $600 for 3 yr. at 6%. At 5%. At 51%. 16. Find the interest of $250 for 41 yr. at 5%. At 6%. At 4%. 17. Find the interest of $400 for 1 mo. at 6%. 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 × 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%. 7. Find the amount of $700 for 3 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%. mo. MODEL. 15 days = 15, or 9. Find the interest of $600 for 2 yr. 7 mo. 20 da. at 5%. MODEL. Time reduced to months = 313 mo. $2.50 × 31 = $79.163 : = interest for 2 yr. 7 mo. 20 da. 10. Find the interest of $560 for 2 yr. 5 mo. 25 da. at 5%. 11. Find the interest of $325 for 4 yr. 3 mo. 18 da. at 4%. 12. Find the interest of $ 450 for 2 yr. 10 mo. 10 da. at 6%. 13. Find the interest of $725 for 3 yr. 7 mo. 6 da. at 4%. 14. Find the interest of $840 for 2 yr. 11 mo. 5 da. at 5%. |
