-20% is the change from 620 to 496
Calculation steps:
[( 496 - 620 ) ÷ 620] x 100 = -20%
Formula
Percentage change = [(496 - 620) / 620] x 100
Subtract the new number by the original number
496 - 620 = -124
-124 ÷ 620 = -0.2
-0.2 x 100 = -20%
Example