Piecewise Function

Question

A retail store buys T-shirts from the manufacturer. The cost is $7.99 per shirt for 1 to 100 shirts, inclusive. Then the price is decreased to $6.99 per shirt thereafter. Write a piecewise-defined function that expresses the cost C(x) (in $) to buy x shirts.

Answer 1

Let x = number of shirts

Let C(x) = cost of shirts

 

C(x) =   { 7.99x      for    1 ≤ x ≤ 100

               6.99x      for     x > 100    }