55.45% is the change from 550 to 855
Calculation steps:
[( 855 - 550 ) ÷ 550] x 100 = 55.45%
Formula
Percentage change = [(855 - 550) / 550] x 100
Subtract the new number by the original number
855 - 550 = 305
305 ÷ 550 = 0.5545454545454546
0.5545454545454546 x 100 = 55.45%