Question
The cost price and the marked price of a book have a
ratio of 5:7. The book is sold at a profit of Rs. 100, and the marked price exceeds the selling price by Rs. 20. Determine the cost price of the book.Solution
Let's assume the cost price and marked price of the book be Rs. 5x and Rs. 7x, respectively Therefore, selling price of the book = Rs. (5x + 100) ATQ; 7x - (5x + 100) = 20 Or, 7x - 5x - 100 = 20 Or, 2x = 120 Or, x = 60 So, cost price of the book = 5x = (5 X 60) = Rs. 300
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