Modern Artifacts can produce keepsakes that will be sold for $81 each. Non-depreciated fixed costs are $1,020 per year and variable costs are $48 per unit. a. If the project requires an initial investment of $3,090 and is expected to last for 7 years and the firm pays no taxes, what are the accounting and NPV break-even levels of sales? The initial investment will be depreciated straight-line over 7 years to a final value of zero, and the discount rate is 11% (Round your answers to the nearest whole dollar.) Accounting break-even sales level $ NPV break-even sales level $ b. How do your answers change if the firm's tax rate is 40%? (Round your answers to the nearest whole dollar.) Accounting break-even sales level $ NPV break-even sales level $