3.64% is the change from 550 to 570
Calculation steps:
[( 570 - 550 ) ÷ 550] x 100 = 3.64%
Formula
Percentage change = [(570 - 550) / 550] x 100
Subtract the new number by the original number
570 - 550 = 20
20 ÷ 550 = 0.03636363636363636
0.03636363636363636 x 100 = 3.64%