Swagelok Enterprises is a manufacture of miniature fittings and valves. Over a 5-year period, the costs associated with one product line were as follows: first cost of $30,000 and annual costs of $18,000. Annual revenue was $27,000 and the used equipment was salvaged for $4000. Calculate the PW of the cash flow at an interest rate of 15%

Provide the formula you used please