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Following is the time-line of a monthly cash flow with the interest rate is j12 = 8% p.a.:
(a) Find the present value of the cash flow if X = Y = $100.
(b) Find the future value of the cash flow if X = 120, Y = 150.
(c) Suppose the future value of this cash flow is $1,320 and the size of payment X is similar to the size of payment Y, or X = Y, find X?