A corporation purchased an asset on $\frac{1}{1}\frac{?}{24}$ for $320,000.$ This asset was depreciated using the straight line method using an estimated salvage value of $20,000$ and a $4$ year useful life. On $\frac{1}{1}\frac{?}{26},$ the corporation changes its depreciation estimates: the estimated salvage value is now $10,000$ and the corporation expects a total useful life of $6$ years.

What would be the appropriate amount of depreciation expense on this asset for $2017?$ Show your work.