48.91% is the change from 550 to 819
Calculation steps:
[( 819 - 550 ) ÷ 550] x 100 = 48.91%
Formula
Percentage change = [(819 - 550) / 550] x 100
Subtract the new number by the original number
819 - 550 = 269
269 ÷ 550 = 0.4890909090909091
0.4890909090909091 x 100 = 48.91%