-73.58% is the change from 159 to 42
Calculation steps:
[( 42 - 159 ) ÷ 159] x 100 = -73.58%
Formula
Percentage change = [(42 - 159) / 159] x 100
Subtract the new number by the original number
42 - 159 = -117
-117 ÷ 159 = -0.7358490566037735
-0.7358490566037735 x 100 = -73.58%