The watch costed $400 before the discount.
76 * 100 = 7,600
7,600 / 19 = 400
2.89
Graph each side of the equation. The solution is the x-value or the point intersection.
0.706 is the answer to your problem
Didn't answer all because I got lazy and I think you should try and do the rest yourself. Did this in 5 mins, try putting more effort into your homework. This is basic mathematics.