write how cash flow of given years are calculate with formula.

Q$.4$ Two new projects are proposed to a company. The Project A will cost $$200,000$ to develop and is expected to have annual cash flow of $$90,000.$ The Project B will cost $$250,000$ to develop and is expected to have annual cash flow of $$100,000.$ The company is very concerned about their cash flow. Using the NPV and Payback period, which project is better from a cashflow standpoint? $,=10\%.$