New Practical Algebra Adapted to the Improved Methods of Instruction in Schools
New Practical Algebra Adapted to the Improved Methods of Instruction in Schools
James B James Bates Thomson
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JP = V (I + rf Rule. — Divide the sum due hy the amount of li at com- potmd interest, for the given time and rate; the quotient will he the present worth. 23. What is the present worth of $1000 due in 4 years, at 5 per cent compound interest ? Solution, P = — ?-- = f^, = $822. 71, Ans. (i+r)" (i. O5)'» 24. What is the present worth of $2300 due in 5 years, at 6 per cent compound interest ? 252 BUSINESS FORMULAS. COMMERCIAL DISCOUNT. 489. Commercial Discount is a per cent taken from the face of ...bills, the marked price of goods, etc. , without regard to time. 490. To Find the Cofmnercial Discount on a Bill of Goods, the Face of the Bill and the Per Cent Discoant being given. Let 6 denote the base or face of the bill, r the rate, and d the discount or percentage. Then bxr will be the discount. Hence, the ' Formula. D = br. Rule. — Multiply the face of the Mil hy the given rate, and the product will be the cornmercial discount, 491. To Find the Cash Value or Net Proceeds of a Bill.
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