390.91% is the change from 55 to 270
Calculation steps:
[( 270 - 55 ) ÷ 55] x 100 = 390.91%
Formula
Percentage change = [(270 - 55) / 55] x 100
Subtract the new number by the original number
270 - 55 = 215
215 ÷ 55 = 3.909090909090909
3.909090909090909 x 100 = 390.91%