68.26% is the change from 397 to 668
Calculation steps:
[( 668 - 397 ) ÷ 397] x 100 = 68.26%
Formula
Percentage change = [(668 - 397) / 397] x 100
Subtract the new number by the original number
668 - 397 = 271
271 ÷ 397 = 0.6826196473551638
0.6826196473551638 x 100 = 68.26%