1. Write the mathematical formulation.

2. What is the optimal solution and optimal objective function value?

B Innovation Research Firm is conducting surveys to assess the satisfaction levels of their customers versus the satisfaction of the customers of the Rival Research firm. The customers are divided into four groups: (1) large customers of Innovation Research Firm, (2) small customers of Innovation Research Firm, (3) large customers of Rival Research Firm, and (4) small customers of Rival Research Firm. A total of 400 customers are being surveyed by telephone or by Zoom. The innovation Research Firm would like to conduct the survey in the least costly way possible. The following conditions must be met regarding the survey: 1. At least 10% but not more than 50% of the total customers should come from each group. E F M Number Con 1 Con 2 Con 3 Con 4 Con 5 Con 6 Cost T1 $18 T2 $14 T3 $25 T4 $20 Z1 $40 Z2 $35 Z3 $60 Z4 $45 Total Min Max 2. At least 70% of the surveyed should be Innovation Research Firm's customers. 3. At least 50% of surveys should be done via Zoom. 4. At least 50% of the large customers of Innovation Research Firm should be surveyed via Zoom. 5. A maximum of 40% of those surveyed can be small customers. 6. A maximum of 25% of the small companies surveyed should be done via Zoom