can you help me with question 2 and 4 only

The annual rate of inflation is a constant 4 percent. The real rate of interest is a 2. constant 2 percent. Nominal cash flows at the end of next four years are 800, 1,200, 750 and 1,500 respectively. Calculate the corresponding real cash flows and the present value of their sum using the real rate of interest. 3. Briefly discuss the different listing methods available to firms wishing to list on the London Stock Exchange. 4. Company A promises an expected return of 15 percent. Company B promises an expected return of 20 percent. The riskfree rate of return is 8 percent. Calculate the expected returns on: (i) a portfolio invested 30 percent in A and 70 percent in B: (i) a portfolio invested 50 percent in the riskfree security and 50 percent in portfolio ()