Apple has a sale for a new iPhone Pro Max. They are selling the phones for $X. That is a Y% markup from their wholesale price. What is Apple's cost for the iPhone Pro Max? Round your answer to the nearest cent.
a) $X - (Y% of $X)
b) $X / (1 + Y%)
c) $X * (1 - Y%)
d) $X / (1 - Y%)