The US Postal Service (USPS) must decide on the minimum number of post office buildings that has to
The US Postal Service (USPS) must decide on the minimum number of post office buildings that has to established in a city, which has seven different districts. Particularly, the USPS wants to build the minimum number of postal offices needed to ensure that at least one postal office is within 20 minutes (driving time) of each district. The times in minutes) required to drive between the districts are shown in the table below. Formulate, solve, and interpret the results of a binary integer program that will tell USPS how many post offices should be built and where they should be located. From District 1 District 2 District 3 District 7 District 1 1 | 27 10 District 5 20 13 District 2 11 District 4 | 10 | 20 8 9 o 13 District 6 24 23 28 7 District 3 8 District 4 29 18 District 5 24 District 6 District 7