if price of t.v set is reduced by 18%, then its sale increases by 72%, find net effect on sale value	Choose the correct option.
A) 41 B) 45 C) 46 D) 47 E) 48

Rationale: "- a + b + ( ( - a ) ( b ) / 100 ) = - 18 + 72 + ( - 18 * 72 ) / 100 = - 18 + 72 - 13 = 41 answer : a"
Answer: A