Using the formula to calculate the total cost:
Cost = (85% x 3 million) + (60% x 3 million) + (20% x 3 million)
Cost = (0.85 x 3 million) + (0.60 x 3 million) + (0.20 x 3 million)
Cost = (2.55 million) + (1.8 million) + (0.6 million)
Cost = 4.95 millions.