The problem states that Rocco has a coupon for 10% off an already discounted price. However, the discounted price itself is not provided in the problem statement.

To solve this, we would typically follow these steps:

1. Let the already discounted price be $P$.
2. The coupon gives a 10% discount, so the discount amount is: $0.10 \times P = 0.1P$
3. The final price after applying the coupon is: $P - 0.1P = 0.9P$

To get a final numerical answer, we need the actual discounted price. Do you have that information? If so, please provide it, and I can complete the calculation!

Meanwhile, here are five related questions for practice:

1. If the original price was $200 and the first discount was 20%, what is the final price after applying Rocco's coupon?
2. What is the percentage of total savings compared to the original price?
3. If the sales tax is 8%, how much does Rocco pay in total after taxes?
4. If Rocco also has a $5 off coupon, how should he apply it to maximize his savings?
5. How much would Rocco save if the coupon was 15% instead of 10%?

Tip: When applying multiple discounts, always apply percentage discounts sequentially, not by adding them together!