-63.75% is the change from 80 to 29
Calculation steps:
[( 29 - 80 ) ÷ 80] x 100 = -63.75%
Formula
Percentage change = [(29 - 80) / 80] x 100
Subtract the new number by the original number
29 - 80 = -51
-51 ÷ 80 = -0.6375
-0.6375 x 100 = -63.75%
Example