-73.53% is the change from 68 to 18
Calculation steps:
[( 18 - 68 ) ÷ 68] x 100 = -73.53%
Formula
Percentage change = [(18 - 68) / 68] x 100
Subtract the new number by the original number
18 - 68 = -50
-50 ÷ 68 = -0.7352941176470589
-0.7352941176470589 x 100 = -73.53%