-79.33% is the change from 150 to 31
Calculation steps:
[( 31 - 150 ) ÷ 150] x 100 = -79.33%
Formula
Percentage change = [(31 - 150) / 150] x 100
Subtract the new number by the original number
31 - 150 = -119
-119 ÷ 150 = -0.7933333333333333
-0.7933333333333333 x 100 = -79.33%