A baseball card decreased in value 50% in its first year and 10% in its second year. What was the total percent decrease of the card's value over the two years?  Choose the correct answer:
A) 28 %	B) 55 %	C) 32 %	D) 36 %	E) 72 %

Rationale: "let the initial value of baseball card = 100 after first year , value of baseball card = ( 1 - 50 / 100 ) * 100 = 50 after second year , value of baseball card = ( 1 - 10 / 100 ) * 50 = 45 total percent decrease of the card ' s value over the two years = ( 100 - 45 ) / 100 * 100 % = 55 % answer b"
Answer: B