Max f$1($x$1,$x$2)=0\mathrm{.}4$x$1+0\mathrm{.}3$ x$2$

Max f$2($x$1,$x$2)=$ x$1$

S$.$t:

X$1+$X$2<=400$

$2$x$1+$x$2<=500$

X$1,$x$2>=0$

Solve with weighted sum method