If the price of a book is first decreased by 50% and then increased by 60%, then the net change in the price will be?  Choose the correct option:
A) 20 % decrease
B) 10 % increase
C) 10 % decrease
D) 15 % increase
E) 25 % decrease

Rationale: "let the original price be $ 100 new final price = 160 % of ( 50 % of $ 100 ) = 160 / 100 * 50 / 100 * 100 = $ 80 decrease is 20 % answer is a"
Answer: A