320% is the change from 55 to 231
Calculation steps:
[( 231 - 55 ) ÷ 55] x 100 = 320%
Formula
Percentage change = [(231 - 55) / 55] x 100
Subtract the new number by the original number
231 - 55 = 176
176 ÷ 55 = 3.2
3.2 x 100 = 320%
Example