Suppose that a company needs new equipment, and that the machinery in question earns the company revenue at a continuous rate of 68000t+38000 dollars per year during the first six months of operation, and at the continuous rate of $72000 per year after the first six months. The cost of the machine is $165000. The interest rate is 8.5% per year, compounded continuously. a) Find the present value of the revenue earned by the machine during the