FinFone Paper Mill Is a Small-Scale Paper Making Company Which

FinFone Paper Mill is a small-scale paper making company which has four making machines to produce four different types of papers. Each type of paper must go through processing on each of four machines. The manufacturing time (in minutes) per unit of paper produced is in the following table:

The maximum time allotted for each machine is 30 hours per week and at least 100 units of each type of paper should be made using these machines during the week.
Profit per unit is:

Develop and solve an all-integer model that will determine, using the available machine time, the number of units of each paper type to be produced in order to meet the weekly demand and to maximize the profit.