-64.2% is the change from 81 to 29
Calculation steps:
[( 29 - 81 ) ÷ 81] x 100 = -64.2%
Formula
Percentage change = [(29 - 81) / 81] x 100
Subtract the new number by the original number
29 - 81 = -52
-52 ÷ 81 = -0.6419753086419753
-0.6419753086419753 x 100 = -64.2%