All the choices are below $120 so we don't have to worry about the 15% discount.
If the original price is x then after the 10% discount the price is 0.9 x and then we pay an additional 7 percent tax on the discounted price, that's 1.07 (0.9 x) which is our total bill of 103.04:
1.07 (0.9 x) = 103.04
x = 103.04 / (1.07 (.9)) = 107.00
Choice C