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Modern Artifacts can produce keepsakes that will be sold for $160 each. Nondepreciation fixed costs are $2,600 per year, and variable costs are $140 per unit. The initial investment of $7,000 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? (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% ? (Do not round intermediate calculations. Round your final answer to the nearest whole number.)