A clothing store offers customers a holiday sale of 25% off the price of x items. A customer then has an additional 10% off coupon that can be used when checking out. Which of the following functions represents the final price P(x) of the items purchased?
P(x) = 0.025x
P(x) = 0.15x
P(x) = 0.35x
P(x) = 0.675x