The cost c of an order is a function of the total price x


An Internet bookstore charges $20 shipping for orders under $100 but provides free shipping for orders of $100 or more. The cost C of an order is a function of the total price x of the books purchased, given by

C(x) = {x + 20    if x < 100

{x if x > 100

Find C(55), C(90), C(100), and C(110).

C(55) = $

C(90) = $

C(100) = $

C(110) = $

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Mathematics: The cost c of an order is a function of the total price x
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