-20.41% is the change from 779 to 620
Calculation steps:
[( 620 - 779 ) ÷ 779] x 100 = -20.41%
Formula
Percentage change = [(620 - 779) / 779] x 100
Subtract the new number by the original number
620 - 779 = -159
-159 ÷ 779 = -0.20410783055198972
-0.20410783055198972 x 100 = -20.41%