minimize Z $=16$X$1$A $+18$X$1$B $+1110+14$X$2$A $+12$X$2$B $+13$X$2$C $+13$X$3$A $+15$X$3$B $+17$X$3$C

subject to

X$1$A $+$ X$1$B $+$ X$1$C $<=300$

X$2$A $+$ X$2$B $+$ X$2$C $<=200$

$+$ X$3$B $+$ X$3$C $<=200$

X$1$A $+$ X$2$A $+$ X$3$A $<=150$

X$1$B $+$ X$2$B $+$ X$3$B $<=250$

X$1$C $+$ X$2$C $+$ X$3$C $<=200$

Xij $>=0$