-50.32% is the change from 157 to 78
Calculation steps:
[( 78 - 157 ) ÷ 157] x 100 = -50.32%
Formula
Percentage change = [(78 - 157) / 157] x 100
Subtract the new number by the original number
78 - 157 = -79
-79 ÷ 157 = -0.5031847133757962
-0.5031847133757962 x 100 = -50.32%