106.55% is the change from 397 to 820
Calculation steps:
[( 820 - 397 ) ÷ 397] x 100 = 106.55%
Formula
Percentage change = [(820 - 397) / 397] x 100
Subtract the new number by the original number
820 - 397 = 423
423 ÷ 397 = 1.0654911838790933
1.0654911838790933 x 100 = 106.55%