[SOLVED] FOR Assignment 3-Shoes manufacturing

A manager has to plan the shoes production for his firm for a single day. 5 models of shoes can be produced, exploiting the handwork of 3 artisans. The time needed by each artisan to manufacture a pair of shoes of each model is indicated in the following table (hours/unit)
Model/Artisan 1 2 3
1 1.5 3.5 4
2 1.8 2 3
3 2 1 2.5
4 2.5 1.5 3.5
5 3.5 3.5 4.2
The next table indicates, for each model of shoes, the selling price and an estimation of the maximal market demand
Model Price Demand
1 56 4
2 86 3
3 45 3
4 42 5
5 65 8
Given an integer linear programming formulation to the problem of maximizing the revenue, subject to production and demand constraints.