Answer:
The given problem states that a coupon reduces the cost of a shirt by $5.16. We also know that the final price paid after using the coupon is $15.48. We need to find the original price of the shirt before the coupon was applied.
Let the original price of the shirt be p.
Using the given information, we can set up the following equation:
p - 5.16 = 15.48
Adding 5.16 to both sides, we get:
p = 20.64
Therefore, the original price of the shirt before the coupon was applied was $20.64.