If during a one-day period the Q train arrives at the station 30% less frequently than the

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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

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