Casper's Cookie Company purchased a delivery van for $40,000 (estimated useful life - 10 years & salyage value $8,450.) Casper's Cookie Company recorded depreciation on the delivery van for 6 years using the straight line method. At the beginning of year 7 Casper's Cookie Company decides that the estimated life of the delivery van should be revised to 11 years and the salvage value should be revised to $2,650. Calculate the depreciation expense for year 7. Show your work