-99.41% is the change from 505 to 3
Calculation steps:
[( 3 - 505 ) ÷ 505] x 100 = -99.41%
Formula
Percentage change = [(3 - 505) / 505] x 100
Subtract the new number by the original number
3 - 505 = -502
-502 ÷ 505 = -0.994059405940594
-0.994059405940594 x 100 = -99.41%