An organisation department manufactures three types of products with varying annual demands using a large contemporary machine. Product A has an annual demand of 300 units; Product B has an annual demand of 500 units; Product C has an annual demand of 600 units. The department works 8 hours per day, 300 days a year. Each unit of Product A and Product B has an average processing time of 2 hours each. The processing time for Product C is 3 hours per unit. What is the required number of machines to meet the demand processing needs?