A firm is considering a project that will generate perpetual cash flows of $15,000 per year beginning next year. The project has the same risk as the firm's overall operations and must be financed externally. Equity costs 14% and debt costs 4% on an after-tax basis. The firm's D/E ratio is 0.8. What is the most the firm can pay for the project and still earn its required return?

The answer according to my text is $157,000 but don't understand why