You chose the correct answer.
Here is the calculation:

The profit from selling the fund is

$200($70 - $50) = $4,000

The fees charged by Fidelity are

Buying: 200 ($50) (0.01) = $100

Selling: 200 ($70) (0,015) = $210

The net profit from the investment is

$4,000 - $100 - $210 = $3,690

The rate of return on the investment is

$3,690/$10,000 = 0.369 or about 36.9%

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