Please help me with this problem. I don't even understand where to start.

You are the accountant for Raleigh Industnes, a manufacturer of plastic gears for electric motors. The company's production facility in Pittsburgh has a cost of $3,600,000, an estimated residual value of $600,000, and an estimated useful life oM-O years. You are using the straight-line method of depreciation for this asset. a. What is the amount of the annual depreciation? l: D. What is the DOOR value Of the property at the end Of the fteenth year of U587 l: c. If at the start of the sixteenth year you revise your estimate so that the remaining useful life is 15 years and the residual value is $90,000, what should he the depreciation expense for each of the remaining 15 years? s