310.86% is the change from 221 to 908
Calculation steps:
[( 908 - 221 ) ÷ 221] x 100 = 310.86%
Formula
Percentage change = [(908 - 221) / 221] x 100
Subtract the new number by the original number
908 - 221 = 687
687 ÷ 221 = 3.1085972850678734
3.1085972850678734 x 100 = 310.86%