Modern artifacts can produce keepsakes that will be sold for $$80$ each. Non$-$depreciation fixed costs are $$2,800$ annually, and variable costs are $$40$ per unit. The initial investment of $$5,000$ will be depreciated straight$-$line over its life of $5$ years to a final value of zero, and the discount rate is $12\%.$ A$)$ What is the accounting break$-$even level of sales if the firm pays no taxes? B$)$ What is the NPV break$-$even level of sales if the firm pays no taxes? C$)$ What is the accounting break$-$even level of sales if the firm's tax rate is $30\%?$ D$)$ What is the NPV break$-$even level of sales if the firm's tax rate is $30\%?$