Consider the system shown below where four point masses are connected to each other by massless rods. Two of the masses are $m=9kg$ and the other two have the masses of $M=6kg.$ If $a=0,7m,b=0,6m$ and the system rotates about $z-$ axis, determine the moment of inertia of the system. Express your answer in units of $kg*m^2$ using one decimal place. $($Figures are shown in question$)$