Answer:
$4,650.89
Explanation:
Year Depreciation rate   Depreciation    Book Value
                      (51000*Rate)
1 Â Â Â Â Â Â 33.33% Â Â Â Â Â Â Â Â Â $16,998.30 Â Â Â Â $34,001.70
2 Â Â Â Â Â 44.45% Â Â Â Â Â Â Â Â Â $22,669.50 Â Â Â Â $11,332.20
3 Â Â Â Â Â 14.81% Â Â Â Â Â Â Â Â Â Â $7,553.10 Â Â Â Â Â Â $3,779.10
4 Â Â Â Â Â 7.41% Â Â Â Â Â Â Â Â Â Â Â $3,779.10
      100%            $51,000
Sale Value                  $5,100
Book Value at end of 3 years   $3,779.10
Net Gain on Sale             $1,320.90
Tax On Gain = $1320.90*0.34
Tax On Gain = $449.11
After-tax salvage value = $5100 - $449.11
After-tax salvage value = $4,650.89