need to know how to solve this without plugging the information into a calculator or excel

1. What is the net present value of a project with the following cash flows if the required rate of return is 12 percent? Year Cash Flow 0 -$42,398 1 13,407 2 21,219 3 17,800 WN a 2. A project will produce cash inflows of $3,200 a year for 4 years with a final cash inflow of $5,700 in year 5. The project's initial cost is $9,500. What is the net present value of this project if the required rate of return is 16 percent