420% is the change from 55 to 286
Calculation steps:
[( 286 - 55 ) ÷ 55] x 100 = 420%
Formula
Percentage change = [(286 - 55) / 55] x 100
Subtract the new number by the original number
286 - 55 = 231
231 ÷ 55 = 4.2
4.2 x 100 = 420%
Example