309.05% is the change from 221 to 904
Calculation steps:
[( 904 - 221 ) ÷ 221] x 100 = 309.05%
Formula
Percentage change = [(904 - 221) / 221] x 100
Subtract the new number by the original number
904 - 221 = 683
683 ÷ 221 = 3.090497737556561
3.090497737556561 x 100 = 309.05%