17.09% is the change from 550 to 644
Calculation steps:
[( 644 - 550 ) ÷ 550] x 100 = 17.09%
Formula
Percentage change = [(644 - 550) / 550] x 100
Subtract the new number by the original number
644 - 550 = 94
94 ÷ 550 = 0.1709090909090909
0.1709090909090909 x 100 = 17.09%