70% is the change from 250 to 425
Calculation steps:
[( 425 - 250 ) ÷ 250] x 100 = 70%
Formula
Percentage change = [(425 - 250) / 250] x 100
Subtract the new number by the original number
425 - 250 = 175
175 ÷ 250 = 0.7
0.7 x 100 = 70%
Example