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210*40 - 300* 40 - 420 * 40
8400 - 12000 - 16800 2
4200 - 6000 - 8400 2
2100 - 3000 - 4200 2
1050 - 1500 - 2100 3
350 - 500 - 700 5
70 - 100 - 140 10
7 10 14 MCD = 2x2x2x3x5x10x=1200