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Math·Problem-Solving and Data Analysis·Percentages

hard

The positive number $a$ is $2,106\%$ of the sum of the positive numbers $b$ and $c$, and $b$ is $81\%$ of $c$. What percent of $b$ is $a$?

A

$4,706\%$

B

$2,600\%$

C

$38.12\%$

D

$21.87\%$