if price of t.v set is reduced by 20%, then its sale increases by 80%, find net effect on sale value  Select the correct option.
A) 44	B) 45	C) 46	D) 47	E) 48

Rationale: "- a + b + ( ( - a ) ( b ) / 100 ) = - 20 + 80 + ( - 20 * 80 ) / 100 = - 20 + 80 - 16 = 44 answer : a"
Answer: A