231.93% is the change from 166 to 551
Calculation steps:
[( 551 - 166 ) ÷ 166] x 100 = 231.93%
Formula
Percentage change = [(551 - 166) / 166] x 100
Subtract the new number by the original number
551 - 166 = 385
385 ÷ 166 = 2.319277108433735
2.319277108433735 x 100 = 231.93%