-50.94% is the change from 159 to 78
Calculation steps:
[( 78 - 159 ) ÷ 159] x 100 = -50.94%
Formula
Percentage change = [(78 - 159) / 159] x 100
Subtract the new number by the original number
78 - 159 = -81
-81 ÷ 159 = -0.5094339622641509
-0.5094339622641509 x 100 = -50.94%