Modern Artifacts can produce keepsakes that will be sold for $$230$ each. Nondepreciation fixed costs are $$4,000$ per year, and variable costs are $$210$ per unit. The initial investment of $$10,500$ will be depreciated straight$-$line over its useful life of five years to a final value of zero, and the discount rate is $10\%.$

What is the accounting break$-$even level of sales if the firm pays no taxes?

What is the NPV break$-$even level of sales if the firm pays no taxes?

Note: Do not round intermediate calculations. Round your final answer to the nearest whole number.

What is the accounting break$-$even level of sales if the firm$$s tax rate is $20\%?$

What is the NPV break$-$even level of sales if the firm$$s tax rate is $20\%?$

Note: Do not round intermediate calculations. Round your final answer to the nearest whole number.

What is the degree of operating leverage for the firm for the NPV break$-$even points when the tax rate is $0\%$ and when the tax rate is $20\%?$