The Shopkeeper increased the price of a product by 25% so that customer finds it difficult to purchase the required amount. But somehow the customer managed to purchase only 72% of the required amount. What is the net difference in the expenditure on that product?  Choose the correct answer
A) 12.5%  B) 10%  C) 15%  D) 17%  E) 19%
Quantity X Rate = Price   1 x 1 = 1   0.72 x 1.25 = 0.9   Decrease in price = (0.1/1) × 100 = 10%   10%)
<result>B</result>
The Shopkeeper increased the price of a product by 25% so that customer finds it difficult to purchase the required amount. But somehow the customer managed to purchase only 72% of the required amount. What is the net difference in the expenditure on that product?