Calculate the below using linear programming. Malek started by saying $$I am in charge of shipping and receiving. Our orders are brought in every morning by our own trucks. The same trucks pick up finished jobs for delivery in the afternoon. We have three trucks: a $10-$footer, a $15-$footer and a $20-$footer, which is newer and can cover out of town up to Milton. Our $10-$footer handles $36$ orders, the $15-$footer can do $56$ and the $20-$footer can do up to $76$ orders a day.$$

You asked Malek about the cost of delivery for these trucks. $$Well$,$ let$$s see,$$ replied Malek picking a pile of invoices and going through them $$considering the salary of drivers, fuel, repairs and other odds and ends, the $10-$footer takes roughly $$16$ for rubber mat jobs and $$12$ for plush jobs. The $15-$footer takes away $$16$ for rubber mat or runner jobs and $$20$ for plush jobs respectively. The $20-$footer grabs $$18$ for rubber mats or runners and $$22$ for plush jobs.$$ You asked him if he has had any issues with them and he said: $$Currently we use these trucks in no particular order and ball park we spend $$3500$ a day. I would like to know if we can do better. I wonder how we can assign orders to them to bring our cost down$.$