*3. OiIco is considering two potential drilling sites for reaching four targets (possible oil wells). The following table provides the preparation costs at each of the two sites and the cost of drilling from site i to target j (i = 1,2; j = 1,2,3,4).

Drilling cost (million $) to target Site 1

2 1

2 4

2 1

6 3

8 3

4 5

1 Preparation cost (million $)

5 6

Fonnulate the problem as an ILP, and find the optimum solution.