A trade analyst announced 10% reduction in the unit price of bike. As a result, the sales volume went up by 10%. What was the net effect on the sales revenue? Choose the correct choice:  A) no change  B) decreases by 1%  C) increases by 1%  D) increases by 10%  E) None of these
Explanation :   Reduction of price = (100 -10)= 
<gadget id="calculator">(100 -10)</gadget>
<output>90</output>
90%= 0.9   Increase of sale = (100+10)= 
<gadget id="calculator">(100+10)</gadget>
<output>110</output>
110%= 1.1   Total effect = 0.9 X 1.1 = 99%, Decreases by 1%   Answer : decreases by 1%
<result>B</result>
A trade analyst announced 10% reduction in the unit price of bike. As a result, the sales volume went up by 10%. What was the net effect on the sales revenue?