A project has a 7 year life and costs $400,000. Depreciation is straight line to zero over the life of the project and there is no salvage value. The tax rate is 30% and a 12% return on this project. Sales are expected to be 75,000 units per year. If the fixed cost per unit is $600,000 per year, the variable cost is $40 per unit and the revenue for each unit is $50:

a) What is the base-case cash flow

b) What is the NPV

please provide the work and explanations