please give me the answer for this question?

2 8 b Real Rate of Return and Real Interest Rate (%) C D1 A B C D 0 30 60 Investment (2002 $ billions) Q.1) What would be the amount of investment (2002$ Billions) at a real interest rate of 4%? (1 mark) Q.2) What would be the amount of investment (2002$ Billions) at a real interest rate of 10%? (1 mark) Q.3) Is it possible to undertake all four projects (A, B, C, and D) if the real interest rate is 10%? If it is not possible to undertake all four projects, which projects can be undertaken? (2 marks)