291.86% is the change from 221 to 866
Calculation steps:
[( 866 - 221 ) ÷ 221] x 100 = 291.86%
Formula
Percentage change = [(866 - 221) / 221] x 100
Subtract the new number by the original number
866 - 221 = 645
645 ÷ 221 = 2.918552036199095
2.918552036199095 x 100 = 291.86%