Answer: c. The firm's cash position in 2006 and 2007 would increase.
Step-by-step explanation:
Depreciation expense is heavily dependent on the useful life of the asset. The longer the useful life, the smaller the depreciation expense because the equipment is being depreciated over a longer period.
If the useful life is reduced from 15 to 10 years therefore, the depreciation expense would increase.
The Cash position of a company is calculated by adding back the depreciation to the Net income after taxes are paid because depreciation is not a cash expense.
If the depreciation is now larger (which it is) and is added back to the Net income, the cash position will therefore increase.