-20.31% is the change from 778 to 620
Calculation steps:
[( 620 - 778 ) ÷ 778] x 100 = -20.31%
Formula
Percentage change = [(620 - 778) / 778] x 100
Subtract the new number by the original number
620 - 778 = -158
-158 ÷ 778 = -0.20308483290488433
-0.20308483290488433 x 100 = -20.31%