Using Lindo software, make the following calculations: Min F $120$X$11+90$X$21+120$X$12+90$X$22+2\mathrm{.}4$S$11+1\mathrm{.}8$S$21+2\mathrm{.}4$X$12+1\mathrm{.}8$S$22$

ST

$20+$X$11-$S$11=150$

$30+$X$21-$S$21=125$

S$11+$X$12-$S$12=200$

S$21+$X$22-$S$22=150$

S$12>=25$

S$22>=25$

$3\mathrm{.}5$X$11+2\mathrm{.}6$X$21>=900$

$3\mathrm{.}5$X$11+2\mathrm{.}6$X$21<=1100$

$3\mathrm{.}5$X$11+2\mathrm{.}6$X$21-3\mathrm{.}5$X$12-2\mathrm{.}6$X$22<=100$

$-3\mathrm{.}5$X$11-2\mathrm{.}6$X$21+3\mathrm{.}5$X$12+2\mathrm{.}6$X$22<=1100$

END