25% is the change from 312 to 390
Calculation steps:
[( 390 - 312 ) ÷ 312] x 100 = 25%
Formula
Percentage change = [(390 - 312) / 312] x 100
Subtract the new number by the original number
390 - 312 = 78
78 ÷ 312 = 0.25
0.25 x 100 = 25%
Example