-35.9% is the change from 78 to 50
Calculation steps:
[( 50 - 78 ) ÷ 78] x 100 = -35.9%
Formula
Percentage change = [(50 - 78) / 78] x 100
Subtract the new number by the original number
50 - 78 = -28
-28 ÷ 78 = -0.358974358974359
-0.358974358974359 x 100 = -35.9%