Dirt Movers, Inc. purchased new depreciable equipment as follows: Cost. $78,000 Residual Value.. $ 6,000 Estimated Useful Life.. 4 years Estimated Total Run-Time Hours..... 72,000 hours (hours are the units of production) Actual Run-Time Hours Year 1............ 18,000 Year 2............. 12,250 Year 3............. 24,500 Year 4......... 20,000 Under the activity-based method of depreciation, what will the depreciation expense be for year 2? O $12,250 O $30,250 O $13,230 O $18,000 none of the above