The cost and revenue function of the company are as follows;
It costs them $350 to make each chair, plus fixed costs for operation of $20,000. Therefore,
let
x = number of chair
cost function = 350x + 20000
The company sells a chair for $450. Therefore,
revenue function = 450x - (350x + 20000)
revenue function = 450x - 350x - 20000
revenue function = 100x - 20000
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