215.41% is the change from 266 to 839
Calculation steps:
[( 839 - 266 ) ÷ 266] x 100 = 215.41%
Formula
Percentage change = [(839 - 266) / 266] x 100
Subtract the new number by the original number
839 - 266 = 573
573 ÷ 266 = 2.154135338345865
2.154135338345865 x 100 = 215.41%