-38.76% is the change from 129 to 79
Calculation steps:
[( 79 - 129 ) ÷ 129] x 100 = -38.76%
Formula
Percentage change = [(79 - 129) / 129] x 100
Subtract the new number by the original number
79 - 129 = -50
-50 ÷ 129 = -0.3875968992248062
-0.3875968992248062 x 100 = -38.76%