Percent And Interest Problems

If during a one-day period the $Q$ train arrives at the station $30\%$ less frequently than the $B$ train, and the $B$ train arrives $10\%$ less frequently than the $F$ train, then the $Q$ train’s frequency is what percent of the $F$ train’s frequency?

A. $27$
B. $40$
C. $60$
D. $63$
E. $90$

The OA is D

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