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Bunuel
A fruit store sells four varieties of mangoes A, B, C and D. If A costs 20% less than B, and C costs 25% less than A, and D costs 30% less than C, what percent of B's cost is D?

A. 36%
B. 38%
C. 40%
D. 42%
E. 44%

B = x
A = 0.8x
C=0.75*0.8x=0.6x
D=0.7*0.6x = 0.42x
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