When the price of an article is reduced by 30%, the sales increases by 50%. The percentage change in the total amount of receipts is?
Select.
A) 5% decrease B) 5% increase C) 10% decrease D) 15% decrease E) none of these
We have, receipts = Price x Sales   Therefore, net % change in receipts   = (x + y + xy/100) %   = [ - 30 + 50 + (-30 x 50)/100]%   = 5% increase.   ANSWER:5% increase
<result>B</result>
When the price of an article is reduced by 30%, the sales increases by 50%. The percentage change in the total amount of receipts is?