309.95% is the change from 221 to 906
Calculation steps:
[( 906 - 221 ) ÷ 221] x 100 = 309.95%
Formula
Percentage change = [(906 - 221) / 221] x 100
Subtract the new number by the original number
906 - 221 = 685
685 ÷ 221 = 3.0995475113122173
3.0995475113122173 x 100 = 309.95%