A flat rectangular plate is subjected to the forces shown, where all

forces are parallel to the $x$ or $y$ axis. Take the value of $F$ to be $200$

N and $P$ to be $300$ N $.$

Problem $04\mathrm{.}017.$b $-$ Resultant Moment of Forces About a Point

Determine the resultant moment of all forces about axis $a,$ which is parallel to the $z$

axis. $($Do not include a minus sign in your response.$)$

The resultant moment of all forces about a axis is