3.45% is the change from 550 to 569
Calculation steps:
[( 569 - 550 ) ÷ 550] x 100 = 3.45%
Formula
Percentage change = [(569 - 550) / 550] x 100
Subtract the new number by the original number
569 - 550 = 19
19 ÷ 550 = 0.034545454545454546
0.034545454545454546 x 100 = 3.45%