On decreasing the price of a colour TV by 15%, its sale is increased by 30%. The effect on the revenue is?
Choose the correct choice from the following answers
A) 20 % decrease  B) 25.5 % increase  C) 16% decrease  D) 30 % increase  E) none of these
Net% change in revenue   = ( x + y + xy/100) %   = [-15 + 30 + ( -15 x 30)/100]% or 25.5%   ANSWER:25.5 % increase
<result>B</result>
On decreasing the price of a colour TV by 15%, its sale is increased by 30%. The effect on the revenue is?