Right now MC is on sale you get an extra 20%, I've figured it out as follows
25, 000 + 5, 000 = 30, 000 for 99.95$ (300.15 MC per dollar)
12, 000 + 2, 400 = 14, 400 for 49.95$ (288.29 MC per dollar)
6, 500 + 1, 300 = 7, 800 for $29.95 (260.43 MC per dollar)
3, 000 + 600 = 3, 600 for $14.95...