The correct option is (C): 76.5
Explanation: To find the selling price of the bicycle after both discounts, let's calculate it step by step.
Original Price: Rs 100
First Discount (10%):
\[\text{Discount} = 100 \times 0.10 = 10\]
\[\text{Price after first discount} = 100 - 10 = 90\]
Second Discount (15%) on the discounted price:
\[\text{Discount} = 90 \times 0.15 = 13.5\]
\[\text{Final Selling Price} = 90 - 13.5 = 76.5\]
Thus, the bicycle was sold for Rs 76.5.