25% is the change from 340 to 425
Calculation steps:
[( 425 - 340 ) ÷ 340] x 100 = 25%
Formula
Percentage change = [(425 - 340) / 340] x 100
Subtract the new number by the original number
425 - 340 = 85
85 ÷ 340 = 0.25
0.25 x 100 = 25%
Example