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?	Choose the correct choice from the following answers:	A) 5 % decrease	B) 5 % increase	C) 10 % decrease	D) 15 % decrease	E) none of these

Rationale: we have , receipts = price x sales therefore , net % change in receipts = ( x + y + xy / 100 ) % = [ - 30 + 50 + ( - 30 x 50 ) / 100 ] % = 5 % increase . answer : b
Answer: B