Because of its age, your car costs $4,000 annually in maintenance expense. You could replace it with a newer vehicle costing $9,300 that would be expected to have a life of 7 years. If your opportunity cost of capital is 10%, by how much must maintenance expense decrease on the new vehicle to justify its purchase?

$

(please round your final result to 2 decimals, but keep as many decimals as possible during calculation)