Lowest Level * 1.5 (Round down)
Highest Level * 0.667 (Round up)
Generic Examples
Level 20 can group up to a 30 (20 * 1.5 = 30)
Level 30 can group down to a 20 (30 * 0.667 = 20)
Rounding Examples
Level 33 can group up to a 49 (33 * 1.5 = 49.5)
Level 50 can group down to a 34 (50 * 0.67 = 33.34)
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