In 1986 the book value of a certain car was 2/3 of the original price, and in 1988 its book value was 1/2 of the original price. By what percentage did the book value for this car decrease from 1986 to 1988?
A. 16(2/3)%
B. 25%
C. 33(1/3)%
D. 50%
E. 75%
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Car depreciation will be given by the value loss (value in 1986 -value in 1988) over value in 1986 times 100%, right?
So let's put it in an algebraic expression (2/3 - 1/2) / (2/3) * 100%.
This is (1/6) / 2/3) * 100% = (3/12)*100% = (1/4)*100% = 25%. The right answer is (B).
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