-77.42% is the change from 31 to 7
Calculation steps:
[( 7 - 31 ) ÷ 31] x 100 = -77.42%
Formula
Percentage change = [(7 - 31) / 31] x 100
Subtract the new number by the original number
7 - 31 = -24
-24 ÷ 31 = -0.7741935483870968
-0.7741935483870968 x 100 = -77.42%