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Question 123
A shopkeeper earns a profit of 12% on selling a book at 10% discount on the printed price. The ratio of the cost price and the printed price of the book is
Solution
Given: Profit = 12%
      Discount on printed price = 10%
     Let's say cost price is $$x$$ and printed price is $$y$$
      hence sold price will be $$x$$ + $$\frac{12x}{100}$$ and $$y$$ - $$\frac{10y}{100}$$
     Both should be equal:
     hence $$x$$ + $$\frac{12x}{100}$$ = $$y$$ - $$\frac{10y}{100}$$
           $$\frac{x}{y}$$ = $$\frac{45}{56}$$Â
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