-79.35% is the change from 402 to 83
Calculation steps:
[( 83 - 402 ) ÷ 402] x 100 = -79.35%
Formula
Percentage change = [(83 - 402) / 402] x 100
Subtract the new number by the original number
83 - 402 = -319
-319 ÷ 402 = -0.7935323383084577
-0.7935323383084577 x 100 = -79.35%