Robert's salary was decreased by 20% and subsequently increased by 20%. how much percentage does he lose?
Choose the correct choice
A) 4 % B) 20 % C) 25 % D) 30 % E) 50 %

Rationale: "let original salary be $ 100 salary after decreasing 20 % = 100 - 100 x 20 / 100 = $ 80 salary after increasing 20 % on $ 80 = 80 + 80 x 20 / 100 = $ 96 percentage of loss = 100 - 96 = 4 % answer : a"
Answer: A