38.5% is the change from 665 to 921
Calculation steps:
[( 921 - 665 ) ÷ 665] x 100 = 38.5%
Formula
Percentage change = [(921 - 665) / 665] x 100
Subtract the new number by the original number
921 - 665 = 256
256 ÷ 665 = 0.3849624060150376
0.3849624060150376 x 100 = 38.5%