Question
The cost of a book includes 10% printing cost, 20%
paper cost and another 15% Ink cost. If other costs add-up to Rs. 110, what is the total cost of the bookSolution
We first convert the percentages to fractions. Printing cost = 10/100 = 1/10 Paper cost = 20/100 = 1/5 Ink cost = 15/100 = 3/20 We sum this fractions to get : (1/10) + (1/5) + (3/20) = (9/20) The remainder is : 1 - (9/20) = (20/20) - (9/20) = 11/20 This is equal to Rs.110 (11/20) = 110 We need to get the total price which is 20/20 (20/11) × 110 = 200 The total price of the book is : Rs 200
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