P$69\mathrm{.}1$ ABC Corporation is considering purchasing a new piece of equipment costing $$500,000.$ The equipment has a useful life of $8$ years with no salvage value. The company uses straight$-$line depreciation. Calculate the annual depreciation expense. Additionally, if the company expects the equipment to generate annual revenue of $$150,000$ and annual operating expenses $($excluding depreciation$)$ of $$40,000,$ determine the annual net operating income before taxes. Finally, if the company$$s tax rate is $30\%,$ calculate the annual net income after taxes.