A. \frac{7}{fg}
B. \frac{7f}{g}
C. \frac{7g}{f}
D. \frac{fg}{7}
E. \frac{f}{7g}

Answer: D

Explanation:
From the question, the cost of one starfish is f/7.
The cost of g starfish is fg/7

Answer choice: D

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