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The price of fan a is twice that of another fan b. The price of a is increased by 10% and that of b is decreased by 20%. Find the percentage decrease in the sum of the prices of fans.

A.	10%	B.	0%
C.	15%	D.	5%

Answer and Explanation

Answer:0%

Explanation:
Let the price of fan b initially be rs x
Price of fan a initially is rs 2x
Increase in the price of a = 10/200 * (2x) = rs 0.2x
Decrease in the price of b = 20/100 *(x) = rs 0.2x
As the increase equals the decrease, the sum of the prices does not change.
There fore the required change is 0%

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