When the price of an article was reduced by 25% its sale increased by 80%. What was the net effect on the sale?	Choose the correct answer.
A) 35 % increase
B) 44 % decrease
C) 60 % increase
D) 66 % increase
E) 66 % decrease

Rationale: "if n items are sold for $ p each , revenue is $ np . if we reduce the price by 25 % , the new price is 0.75 p . if we increase the number sold by 80 % , the new number sold is 1.8 n . so the new revenue is ( 0.75 p ) ( 1.8 n ) = 1.35 np , which is 1.35 times the old revenue , so is 35 % greater . answer : a"
Answer: A