A business owner used a revenue function and a cost function to analyze his monthly sales. One month he found that with a sales volume of 600 items...

A business owner used a revenue function and a cost function to analyze his monthly sales. One month

he found that with a sales volume of 600 items he had revenues of $54,000.

Another month he had

total costs of $20,800 on a sales volume of 400 items. He also finds that the breakeven point is 20

items.

a.

Find the revenue function.

b.

Find the cost function.