A project has the following cash flows:

Year Cash Flow

$0$$ $16,800$

$17,500$

$28,800$

$37,300$

a$.$

What is the NPV at a discount rate of zero percent? What is the NPV at a discount rate of $11$ percent? What is the NPV at a discount rate of $21$ percent? What is the NPV at a discount rate of $29$ percent?