A track dozer cost $$195,000$to purchase. Fuel, oil, grease, and minor maintenance are estimated to cost $$45\mathrm{.}00$ per operating hour. A major engine repair cost $$30,000$ will probably be required after $7,500$ hr of use. The expected resale price $($salvage vale$)$ is $25\%$ of the original purchase price. The machine is expected to have a useful life of $12,000$ hr$.$ How much should the owner of the machine charge per hour of use, if the machine is expected to operate $1500$ hr$.$ per year? The company$$s cost$-$of$-$capital rate is $7\mathrm{.}5\%.$