20.91% is the change from 397 to 480
Calculation steps:
[( 480 - 397 ) ÷ 397] x 100 = 20.91%
Formula
Percentage change = [(480 - 397) / 397] x 100
Subtract the new number by the original number
480 - 397 = 83
83 ÷ 397 = 0.20906801007556675
0.20906801007556675 x 100 = 20.91%