Suria Company Sdn. Bhd. has three production plants, each of which produces three different models of a particular product. The daily capacities of the three plants are as follows.

	Model 1(Units)	Model 2 (Units)	Model 3 (Units)
Plant 1	8000	4000	8000
Plant 2	6000	6000	3000
Plant 3	12000	4000	8000

The total demand for Model 1 is 300,000 units, for Model 2 is 172,000 units, and for Model 3 are 249,500 units. Moreover, the daily operating cost for Plant 1 is RM55,000, for Plant 2 is RM60,000, and for Plant 3 is RM60,000. By using the Excel Solver, determine the number of days should each plant be operated in order to fill the total demand, and keep the operating cost at a minimum. Note: You might have to prepare a report for proposing an optimal solution by using quantitative analysis techniques.