-99% is the change from 402 to 4
Calculation steps:
[( 4 - 402 ) ÷ 402] x 100 = -99%
Formula
Percentage change = [(4 - 402) / 402] x 100
Subtract the new number by the original number
4 - 402 = -398
-398 ÷ 402 = -0.9900497512437811
-0.9900497512437811 x 100 = -99%