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
Which of the following is equivalent to 
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