The original price (y) of the Giant's football jersey is $140.
Let's denote the original price of the Giant's football jersey as y. With a 10% discount, the discounted price is 0.9y (90% of the original price). After applying a 7% sales tax to the discounted price, the final cost is given by 0.9y×1.07.
The problem states that this final cost is $115.56. Therefore, we can set up the equation:
0.9y×1.07=115.56
Solving this equation, we find that the original price (y) of the football jersey is $140. This takes into account both the discount and the sales tax, providing a clear understanding of the original cost before any adjustments.