-80.25% is the change from 157 to 31
Calculation steps:
[( 31 - 157 ) ÷ 157] x 100 = -80.25%
Formula
Percentage change = [(31 - 157) / 157] x 100
Subtract the new number by the original number
31 - 157 = -126
-126 ÷ 157 = -0.802547770700637
-0.802547770700637 x 100 = -80.25%