-94.06% is the change from 505 to 30
Calculation steps:
[( 30 - 505 ) ÷ 505] x 100 = -94.06%
Formula
Percentage change = [(30 - 505) / 505] x 100
Subtract the new number by the original number
30 - 505 = -475
-475 ÷ 505 = -0.9405940594059405
-0.9405940594059405 x 100 = -94.06%