-67.74% is the change from 31 to 10
Calculation steps:
[( 10 - 31 ) ÷ 31] x 100 = -67.74%
Formula
Percentage change = [(10 - 31) / 31] x 100
Subtract the new number by the original number
10 - 31 = -21
-21 ÷ 31 = -0.6774193548387096
-0.6774193548387096 x 100 = -67.74%