The shopkeeper increased the price of a product by 25% so that customer finds difficult to purchase the required amount. But Somehow the customer managed to purchase only 70% of the required amount. What is the net difference in the expenditure on that product ?
Choose the most appropriate option.
A) 55 more
B) 10% more
C) 12.5% less
D) 17.5% less
E) None of these
Solution: Let initially the quantity and rate be 100 each.   Quantity*rate = Expenditure   100*100= 
<gadget id="calculator">100*100</gadget>
<output>10_000</output>
10000   Now, Increase in price is 25% and new quantity is 70% of original.   Quantity*rate= Expenditure   70*125= 
<gadget id="calculator">70*125</gadget>
<output>8_750</output>
8750   Decreased expenditure,= 10000-8750= 
<gadget id="calculator">10000-8750</gadget>
<output>1_250</output>
1250   % decrease,= (1250*100)/10000= 
<gadget id="calculator">(1250*100)/10000</gadget>
<output>25/2 = around 12.5</output>
12.5%.   Answer: Option 12.5% less
<result>C</result>
The shopkeeper increased the price of a product by 25% so that customer finds difficult to purchase the required amount. But Somehow the customer managed to purchase only 70% of the required amount. What is the net difference in the expenditure on that product ?