Modern Artifacts can produce keepsakes that will be sold for $70 each. Nondepreciation fixed costs are $2,000 per year, and variable costs are $35 per unit. The initial investment of $4,000 will be depreciated straight-line over its useful life of 5 years to a final value of zero, and the discount rate is 10%. (For all the requirements, do not round intermediate calculations. Round your answer to the nearest whole number.) 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 40%? d. What is the NPV break-even level of sales if the firm's tax rate is 40%? a. Acounting break-even level of sales b. NPV break-even level of sales c. Acounting break-even level of sales d. NPV break-even level of sales units units units units