69.2% is the change from 250 to 423
Calculation steps:
[( 423 - 250 ) ÷ 250] x 100 = 69.2%
Formula
Percentage change = [(423 - 250) / 250] x 100
Subtract the new number by the original number
423 - 250 = 173
173 ÷ 250 = 0.692
0.692 x 100 = 69.2%
Example