-81.28% is the change from 422 to 79
Calculation steps:
[( 79 - 422 ) ÷ 422] x 100 = -81.28%
Formula
Percentage change = [(79 - 422) / 422] x 100
Subtract the new number by the original number
79 - 422 = -343
-343 ÷ 422 = -0.8127962085308057
-0.8127962085308057 x 100 = -81.28%