A bookseller sold 500 copies of a book at a profit of 20 %. If he gains a profit of Rs. 5/book, what is thecost price of the book? (
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Step-by-step explanation:
Copy sold= 500
total cost price=x
cp per copy= x/500
profit=20%
Profit%= profit/cp × 100
20= 5/x/500 ×100
20= 2500/x × 100
x= 2500×100/20
= 2500×5
= 12500
Therefore cp per copy= x/500= 12500/500= 125/5= 25.
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