Problem 4 (Required, 25 marks) (*Take t = 0 be the current time in this problem) We consider the following three sets of cashflows: Set A: It pays $200, $300 and $500 at time 1, time 2 and time 3 respectively. Set B: It pays $300 and $700 at time 1 and time 3 respectively. Set C: It pays $2X and $3X at time 2 and time 3 respectively. It is given that the money grows at an annual effective interest rate i (where i > 0). Suppose that the present values of these 3 sets of cashflows at time 1 are equal, calculate the present value of set C at time 0