a$.$ For this$$ base$-$case scenario, what is the NPV of the plant to manufacture lightweight$$ tractors?

b$.$ Based on input from the marketing$$ department, Buhler is uncertain about its revenue forecast. In$$ particular, management would like to examine the sensitivity of the NPV to the revenue assumptions. What is the NPV of this project if revenues are $10\%$ higher than$$ forecast? What is the NPV of this project if revenues are $10\%$ lower than$$ forecast?