70.4% is the change from 250 to 426
Calculation steps:
[( 426 - 250 ) ÷ 250] x 100 = 70.4%
Formula
Percentage change = [(426 - 250) / 250] x 100
Subtract the new number by the original number
426 - 250 = 176
176 ÷ 250 = 0.704
0.704 x 100 = 70.4%
Example