On January 1, Jamaica Company purchased equipment for $18,000. The estimated salvage value is $4,000 and the estimated useful life is 5 years. On December 31 of the fourth year, and before adjusting entries have been made, the company decided to extend the estimated useful life of the equipment by two years giving it a total life of 7 years. The company did not change the salvage value and continues to use the straight-line method. What is the depreciation expense for the fourth year?
a) $4,000
b) $2,000
c) $2,800
d) $1,400
e) $1,500