$2.$ The same backhoe$/$loader in Problem $1$ is equipped with four tires that cost $$7,000$each. The tires have a life of $4,000$ hours. The cost of repairs to tires is expected tobe $15\%$ of the depreciation of the tires. No spare parts are used in the repairs oftires, and no transportation$-$assembling$-$dismantling is required.The annual cost of maintenance and repair of the backhoe$/$loader $($excluding thetires$)$ is $75\%$ of the annual depreciation cost of the equipment $($excluding the tires$).$Assuming again an operating factor of $45\%,$ determine the probable cost per hour ofowning and operating this backhoe$/$loader using the standard approach, but treat themachine and the tires separately. The costs of Diesel fuel and lubricating oil are thesame as those stated in Problem $1.$