Question

A publisher sells a book for rupees 216 at a profit of 20% . If the cost of production increased by 30%, find the increase in price of the book so that the profit percentage of publisher remains the same .

Answer 1

Let the original price be x. 

Given profit = 20%.

Selling price = x + x * 20/100 = 216

                      6x/5 = 216

                      x = 216 * 5/6 

                      x = 180.

Given, cost of production increased by 30% =  180 * 130/100

                                                                           = 234.

Profit = 20%. = 234 * 120/100

                     = 280.8

Increase in price of the book = 280.8 - 216

                                                 = 64.8
.

Hope this helps!