-98.83% is the change from 257 to 3
Calculation steps:
[( 3 - 257 ) ÷ 257] x 100 = -98.83%
Formula
Percentage change = [(3 - 257) / 257] x 100
Subtract the new number by the original number
3 - 257 = -254
-254 ÷ 257 = -0.9883268482490273
-0.9883268482490273 x 100 = -98.83%