Final answer:
The original price of the t-shirt was $14.40.
Step-by-step explanation:
To find out how much the same t-shirt would cost today, we need to first calculate the original price of the t-shirt before the 25% off sale.
Let's assume the original price is 'x'.
Since Chris bought the t-shirt for $10.80 after the discount, we can set up the equation:
x - 0.25x = $10.80.
Simplifying the equation gives us:
0.75x = $10.80.
Dividing both sides by 0.75 gives us :
x = $14.40.
Therefore, the original price of the t-shirt was $14.40.