A grading contractor owns two large graders valued at $$80,000$ each, three $40$ C$.$Y$.$ trucks valued at

$$50,000$ each. two payloads valued at $$40,000$ each, and a compactor valued at $$35,000.$ Assuming a

$10-$year life span for each of these equipment and using the straight$-$line depreciation method, estimate

the combined hourly depreciation rate of these equipment. $($Hints: assume salvage value of $10\%$ of

initial price and that all equipment have a $2,000$ hour$/$year of working time$).$