1. **State the problem:** Aaron purchased a shirt that originally costs 165 but received a 10% discount. We need to find out how much he actually paid.
2. **Formula for discount price:**
The price after discount is given by:
$$\text{Discounted Price} = \text{Original Price} \times (1 - \text{Discount Rate})$$
where the discount rate is expressed as a decimal.
3. **Convert the discount percentage to decimal:**
10% = 0.10
4. **Calculate the discounted price:**
$$\text{Discounted Price} = 165 \times (1 - 0.10)$$
$$= 165 \times 0.90$$
5. **Multiply to find the final price:**
$$165 \times 0.90 = 148.5$$
6. **Interpretation:**
Aaron paid 148.5 for the shirt after the 10% discount.
**Final answer:**
$$\boxed{148.5}$$
Discount Price 02D7A6
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