$8.)$ If an asset is depreciated using the units of production method and has an expected life of $150,000$ machine hours, original cost of $$175,000$ and residual value of $$25,000,$ what would be the first years depreciation expense assuming $8,000$ machine hours are run?

a$.$ Depreciation expense would be $$4,200$

b$.$ Depreciation expense would be $$17,500$

c$.$ Depreciation expense would be $$15,000$

d$.$ Depreciation expense would be $$8,000$