Question 7 3 pts Equipment cost $35,000 when it was purchased a few years ago. At that time it was estimated to have a useful life of 7 years and a residual value of $2,000. Since the equipment was acquired, a total of $20,000 of depreciation has been taken on it. What is the net book value of the equipment today? $35,000 $33,000 $13,000 $15,000