50% is the change from 554 to 831
Calculation steps:
[( 831 - 554 ) ÷ 554] x 100 = 50%
Formula
Percentage change = [(831 - 554) / 554] x 100
Subtract the new number by the original number
831 - 554 = 277
277 ÷ 554 = 0.5
0.5 x 100 = 50%
Example