-25.21% is the change from 829 to 620
Calculation steps:
[( 620 - 829 ) ÷ 829] x 100 = -25.21%
Formula
Percentage change = [(620 - 829) / 829] x 100
Subtract the new number by the original number
620 - 829 = -209
-209 ÷ 829 = -0.25211097708082025
-0.25211097708082025 x 100 = -25.21%