-80.33% is the change from 422 to 83
Calculation steps:
[( 83 - 422 ) ÷ 422] x 100 = -80.33%
Formula
Percentage change = [(83 - 422) / 422] x 100
Subtract the new number by the original number
83 - 422 = -339
-339 ÷ 422 = -0.8033175355450237
-0.8033175355450237 x 100 = -80.33%