A firm plans to sell its current machine and buy a new one. The new machine costs $$300,000$ and will have straight$-$line depreciation for $10$ years. The current machine has a remaining book value of $$50,000$ but could be sold at a market price of $$100,000.$ The firm's tax rate is $40\%.$

$2.$ After purchasing the new machine for EIGHT years, the remaining book value of the machine is: