-50% is the change from 58 to 29
Calculation steps:
[( 29 - 58 ) ÷ 58] x 100 = -50%
Formula
Percentage change = [(29 - 58) / 58] x 100
Subtract the new number by the original number
29 - 58 = -29
-29 ÷ 58 = -0.5
-0.5 x 100 = -50%
Example