11.09% is the change from 550 to 611
Calculation steps:
[( 611 - 550 ) ÷ 550] x 100 = 11.09%
Formula
Percentage change = [(611 - 550) / 550] x 100
Subtract the new number by the original number
611 - 550 = 61
61 ÷ 550 = 0.11090909090909092
0.11090909090909092 x 100 = 11.09%