39.64% is the change from 550 to 768
Calculation steps:
[( 768 - 550 ) ÷ 550] x 100 = 39.64%
Formula
Percentage change = [(768 - 550) / 550] x 100
Subtract the new number by the original number
768 - 550 = 218
218 ÷ 550 = 0.39636363636363636
0.39636363636363636 x 100 = 39.64%