New Practical Algebra Adapted to the Improved Methods of Instruction in Schools

Cover 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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