How to calculate these problems? Please show the detailed steps for these problems. I don't know how to do. Thank you so much!!!

Shop, Shop, and Shop Some More is considering the following two strategic projects. The projects are independent and will require a return of 15.0%. The cash flows are projected to be: Year Project CBA Project PON 0 1 2 3 4. ($140,000) $61,500 $73,400 $68,100 $40,500 ($359,000) $159,300 $168,400 $154,800 $110,400 3 Required: A. If it is appropriate to use the Net Present Value method, what is the NPV on both projects? B. If it is appropriate to use the Internal Rate of Return method, what is the IRR on both projects? C. Which project or projects, if any, should Shop, Shop, and Shop Some More accept?||