A trade analyst announced 15% reduction in the unit price of bike. As a result, the sales volume went up by 15%. What was the net effect on the sales revenue?	Choose the most appropriate option:
A) no change
B) decreases by 6.5%
C) increases by 6.5%
D) increases by 5.6%
E) None of these
Explanation :   Reduction of price = (100 -15)= 
<gadget id="calculator">(100 -15)</gadget>
<output>85</output>
85%= 0.85   Increase of sale = (100+15)= 
<gadget id="calculator">(100+15)</gadget>
<output>115</output>
115%= 1.15   Total effect = 0.85 X 1.15 = 93.5%, Decreases by 6.5%   Answer :decreases by 6.5%
<result>B</result>
A trade analyst announced 15% reduction in the unit price of bike. As a result, the sales volume went up by 15%. What was the net effect on the sales revenue?