answer for both depreciation expense and book value

On January 2 , Year 1 , Foster Company purchased equipment costing $21,600. The equipment has an estimated salvage value of $1,440 and an estimated useful life of 12 years. Foster Company uses straight-line depreciation. On January 5 of Year 5 , new information suggests that the equipment will have a total useful life of 9 years and a revised salvage value of $1,080. Required: 1. Compute depreciation expense for Year 5. 2. Compute the book value of the equipment at the end of Year 5