250% is the change from 166 to 581
Calculation steps:
[( 581 - 166 ) ÷ 166] x 100 = 250%
Formula
Percentage change = [(581 - 166) / 166] x 100
Subtract the new number by the original number
581 - 166 = 415
415 ÷ 166 = 2.5
2.5 x 100 = 250%
Example