Answer:
60$ is the normal price.
Why:
Because if 45$ is 75%, then 30$ is 50%, 15 is 25%, and 0 is 0%. 50% + 50% = 100%. (That's how I did this one, anyway. This works on any 25%, 50%, or 75% problem.)
xn+yn=zn where n>2 and n is an integer
<h2>bolded letters are exponents!!!!</h2>
The to that problem is 56
