Over the past 3 years an investment returned 18%, -12%, and 15%. What is the variance of returns? O 231 0546 961 0182 pe here to search OCTO Because of its age, your car costs $4.000 annually in maintenance expense. You could replace it with a newer vehicle costing $8,000. Both vehicles would be expected to last 4 more years, at which point they will be valueless. If your opportunity cost Is 8%, by how much must maintenance expense decrease on the newe vehicle to justify its purchase? $1,469.08 $1.625.40 $1.584.63 $1,409.54