122.8% is the change from 250 to 557
Calculation steps:
[( 557 - 250 ) ÷ 250] x 100 = 122.8%
Formula
Percentage change = [(557 - 250) / 250] x 100
Subtract the new number by the original number
557 - 250 = 307
307 ÷ 250 = 1.228
1.228 x 100 = 122.8%
Example