$12\mathrm{.}11$ A $400-$fwhp diesel$-$powered dozer will be used to support a scraper fleet. This dozer was purchased for $$395,000.$ The estimated salvage value at the end of $4$ years is $$105,000.$ The company's cost$-$of$-$capital is $7\mathrm{.}6\%.$ The work will be at an efficiency equal to a $50-$min hour. The engine will work at full throttle while push loading the scrapers $(59\%$ of the time$)$ and at three$-$quarter throttle to travel and position. The crankcase capacity is $16$ gallons and the company has a policy to change oil every $150$ hours. The annual cost of repairs equals $68\%$ of the straight$-$line machine depreciation. Fuel costs $$\frac{1\mathrm{.}03}{?}$ gallon and oil is $$\frac{2\mathrm{.}53}{?}$ gallon. The cost of other lubricants and filters is $$\frac{0\mathrm{.}65}{?}$ hour. The dozer will work $1,800$ hours$/$year$.$ In this usage, the estimated life for cutting edges is $410$ hours. The local price for a set of cutting edges is $$1,300.$ What is the operating cost for the dozer in this application?