The National Arithmetic On the Inductive System Combining the Analytic And Syn

Cover The National Arithmetic On the Inductive System Combining the Analytic And Syn
The National Arithmetic On the Inductive System Combining the Analytic And Syn
Benjamin Greenleaf
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If for $100 I receive $125, it is evident that for $1 I shall receive only T ^ of $125 = $1. 25, and for $4 I shall have 4 times $1. 25 = $ 5, answer as before.
4. If I buy cloth at $ 5 per yard, for what must I dispose of it per yard to lose 20 per cent. ? Ans. $ 4.
OPERATION BY PROPORTION.
$100 $ 20 = $ 80 ; $100 : $ 80 : : $ 5 : $ 4 Ans.
By analysis. If $ 80 are to be received for $100, it is cer- tain "that for $ 1 there will be paid only T 8 a Tr = fc of a dollar = SECT. LVIII. ] PROFIT AN
...D LOSS. 231 $ 0. 80, and for $ 5 I can receive only 5 times $ 0. 80 = $ 4, an- swer as before ; therefore, to ascertain at what price to sell an article to gain or lose a certain per cent, we adopt the following RULE. As $ 100 is to $ 100 with the profit added or loss subtract- ed, so is the price given to the price required.
5. If I sell cloth at $ 5 per yard, and thereby make 25 per cent. , what was the prime cost of the goods ?
OPERATION B7 PROPORTION.
$100 + $25 = $125; $125 : $100 :: $5 : $4 Ans.


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