Please provide equations for how to solve this problem set.

Units of Production Curry Company purchased a machine that cost $21,500 has an estimated residual value of $1,500, and has an estimated useful life of 50,000 machine hours. The company ran the machine 3,000 hours in year 1, 8,000 hours in year 2, 7,000 hours in year 3 and 6,000 Year 4. 1. If Curry uses the units of production method of depreciation, what is Curry's depreciation expense in year 2? 2. If Curry uses the units of production method of depreciation, what is Curry's accumulated depreciation at the end of year 2 3. If Curry uses the units of production method of depreciation, what is Curry's book value at the end of year 2