54.55% is the change from 550 to 850
Calculation steps:
[( 850 - 550 ) ÷ 550] x 100 = 54.55%
Formula
Percentage change = [(850 - 550) / 550] x 100
Subtract the new number by the original number
850 - 550 = 300
300 ÷ 550 = 0.5454545454545454
0.5454545454545454 x 100 = 54.55%