40% is the change from 665 to 931
Calculation steps:
[( 931 - 665 ) ÷ 665] x 100 = 40%
Formula
Percentage change = [(931 - 665) / 665] x 100
Subtract the new number by the original number
931 - 665 = 266
266 ÷ 665 = 0.4
0.4 x 100 = 40%
Example