-79.47% is the change from 151 to 31
Calculation steps:
[( 31 - 151 ) ÷ 151] x 100 = -79.47%
Formula
Percentage change = [(31 - 151) / 151] x 100
Subtract the new number by the original number
31 - 151 = -120
-120 ÷ 151 = -0.7947019867549668
-0.7947019867549668 x 100 = -79.47%