-77.22% is the change from 79 to 18
Calculation steps:
[( 18 - 79 ) ÷ 79] x 100 = -77.22%
Formula
Percentage change = [(18 - 79) / 79] x 100
Subtract the new number by the original number
18 - 79 = -61
-61 ÷ 79 = -0.7721518987341772
-0.7721518987341772 x 100 = -77.22%