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Difficult

Percentages of Letters

GMAT-YNXBEX

If $30\%$ of $a$ equals $b$, $40\%$ of $b$ equals $c$, and $50\%$ of $c$ equals $d$, what percent of $a$ equals $d$?

A

$6\%$

B

$12\%$

C

$18\%$

D

$36\%$

E

$72\%$