56.55% is the change from 550 to 861
Calculation steps:
[( 861 - 550 ) ÷ 550] x 100 = 56.55%
Formula
Percentage change = [(861 - 550) / 550] x 100
Subtract the new number by the original number
861 - 550 = 311
311 ÷ 550 = 0.5654545454545454
0.5654545454545454 x 100 = 56.55%