Please show work for all problems please

Problems 9-12 are based on the following information: ZZZ inc. would like to implement a new project. It is estimated that the project's costs at t=0 will be $200,000 and during the next 7 years the project will generate the following cash flow: C =$50,000; C =$110,000; C3=$40,000; C4=$35,000; Cs=$30,000; C =$25,000; C7=$90,000. The cost of capital (discount rate) is 12% 2 Problem 9: Find the project's payback period Problem 10: Find the project's discounted payback period Problem 11: Find the project's NPV Problem 12: Find the project's profitability index