Modern Artifacts can produce keepsakes that will be sold for $$100$ each. Nondepreciation fixed costs are $$1,400$ per year, and variable

costs are $$80$ per unit. The initial investment of $$4,000$ will be depreciated straight$-$line over its useful life of five years to a final value

of zero, and the discount rate is $10\%.$

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?

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

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

d$.$ 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.

e$.$ 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 $20\%?$

Note: Round intermediate calculation to the nearest whole number. Round your answers to $2$ decimal places.