Question $3$ Following is the time$-$line of a monthly cash flow with the interest rate is j$\_12=6\%$ p$.$a$.$: $($a$)$ Find the Future 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 $ $1,220$ and find the size of Y if X is $80?$