308.6% is the change from 221 to 903
Calculation steps:
[( 903 - 221 ) ÷ 221] x 100 = 308.6%
Formula
Percentage change = [(903 - 221) / 221] x 100
Subtract the new number by the original number
903 - 221 = 682
682 ÷ 221 = 3.085972850678733
3.085972850678733 x 100 = 308.6%