Please help with ST homework. Please show work in detail will rate.!

Consider an investment in a project having a first cost of $300,000, operating and maintenance costs of $45,000 per year, a profit of $65,000 per year, and an estimated disposal cost of $50,000 (toxic chemicals) at the end of 12 years. Assuming an interest rate of 6%, what is the present equivalent cost of the investment? Assuming an interest rate of 6%, what is the equivalent annual cost of the investment? Assuming an interest rate of 2%, what is the equivalent annual cost of the investment