To calculate the price of the shirt after a 15% discount:

1. The original price of the shirt is $25.
2. The discount amount is 15% of $25.

We can find the discount amount by multiplying $25 by 15% (or 0.15): $\text{Discount} = 25 \times 0.15 = 3.75$

3. Subtract the discount from the original price: $\text{Final Price} = 25 - 3.75 = 21.25$

So, the price of the shirt after the discount is $21.25.

Would you like more details on this, or do you have any questions?

Here are 5 related questions:

1. What is the final price if the discount is 20% instead of 15%?
2. How do you calculate the final price with tax included?
3. How would the price change if an additional discount is applied after the 15%?
4. If you buy 3 shirts, how much would the total cost be after the discount?
5. What if the shirt was originally priced at $30 instead of $25?

Tip: To quickly calculate a discount, multiply the original price by the decimal equivalent of the discount percentage.