The company is considering to invest in a project with following information:

$-$ The total investment of the project $2500$ monetary unit. Cost of purchasing fixed assets is $2,350$monetary unit, the rest of the capital to buy the net assets at the beginning of the second year. The funding for fixed assets in the early first year and the early second year, respectively is $1350$ and $1000$ monetary unit.

$-$ Straight line depreciation within $6$ years of the project. When the project is finished, the liquidation assets is $50$ monetary unit.

$-$ Net working assets are revoked when finished project.

$-$ When the project goes into operation period $($from the second year$),$generating a revenue of $3,500$ monetary unit yearly, the variable costs are $500$ per year, annual fixed costs excluding depreciation and interest $200$ monetary unit$-$ The corporate income tax rate is $25\%.$ The discount rate of the project is $16\%$ per year.

$-$ The owners are considering to borrow money from banks to finance the project, namely to borrow $60\%$ of the total capital to invest in fixed asset with interest rate of $14\%$ per year within $5$ years, interest is paid under the principal balance, principal is paid from having revenue. Requirements:

a$)$ Determine the annual cash flow for the project.

b$)$ Use IRR to help the company make decision.