On January $1,2005,$ Kent Corporation purchased a machine for $$50,000.$ paid shipping expenses of $$500$ as well as installation costs of $$1,200.$ The machine was estimated to have a useful life of $10$ years and an estimated salvage value of $$3,000.$ in January $2006,$ additions costing $$3,600$ were made to the machine in order to comply with pollution control ordinances. These additions neither prolonged the life of the machine nor did they have any salvage value. If records depreciation under the straight$-$line method, depreciation expense for $2006$ is

$$4,870$

$$5,170$

$$5,270$

$$ $$5,570$