6. What would be the net present value of a microwave oven that costs $119 and will save you $72 per year in time and food away from home? Assume an average return on your savings of 4% for five years. 7. Based on financial and opportunity costs, which of the following do you believe would be the wiser purchase? Vehicle 1: A three-year-old car with 45,000 miles, costing $15700 and requiring $585 of immediate repairs Vehicle 2: A five-year-old car with 62,000 miles, costing $9500 and requiring $960 of immediate repairs