On decreasing the price of a Computer by 10%, its sale is increased by 40%. The effect on the revenue is? Choose the most appropriate option
A) 4% decrease
B) 28% increase
C) 16% decrease
D) 26% increase
E) none of these
Net% change in revenue   = ( x + y + xy/100) %   = [-10 + 40 + ( -10 x 40)/100]% or 26%   ANSWER:26% increase
<result>D</result>
On decreasing the price of a Computer by 10%, its sale is increased by 40%. The effect on the revenue is?