integer programing please. Part 4.1 and 4.2

4. Integer Programming Models. (15 points modeling+5 points question) Ed Ada Con or E Seler SIE My cell phone has three different SIM cards, each of them associated with a different company: SIM card 1 is associated with company A, SIM card 2 is associated with company B, and SIM card 3 is associated with company C (SIM cards association cannot be changed). Company A charges me $16 fixed a month, and $0.25 per minute of call. Company B charges me $25 fixed a month, and $0.21 per minute of call. Company C charges me $18 fixed a month, and $0.22 per minute of call. I need to make calls for at least 200 minutes every month. If I don't pay the fixed charge of a company, I cannot make calls with this company. can use any combination of companies to make all the calls I require. I need some help to minimize my cell phone bill. Con Mic Docu Engli 4.1) Following the 5 steps introduced in class, model the above problem. Do not solve. 4.2) (Please add the following requirement after modeling, you do not need to write the whole model again) Instead of using any combination of companies to make calls, you can use at most two companies to make calls. W X R). Z 23