-67.44% is the change from 129 to 42
Calculation steps:
[( 42 - 129 ) ÷ 129] x 100 = -67.44%
Formula
Percentage change = [(42 - 129) / 129] x 100
Subtract the new number by the original number
42 - 129 = -87
-87 ÷ 129 = -0.6744186046511628
-0.6744186046511628 x 100 = -67.44%