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4. Calculate the net present value of the following project. A project costs $90,000 and generates $20,000 in the 1st year, $25,000 in the 2nd year, $50,000 in the 3rd year, and $15,000 in the 4th year. Assume 8% annual discount rate 5. Calculate the present value of a perpetuity, which pays $1,000 every year, if the annual interest rate is 10% 6. Calculate the present value of a perpetuity, which currently pays $1,000 every year. The payment is expected to grow 2% starting next year. Assume the annual interest rate is 10% 7. What is the present value of a 180-month annuity which pays $500 a month? Assume the annual interest rate of 7%