-96.63% is the change from 505 to 17
Calculation steps:
[( 17 - 505 ) ÷ 505] x 100 = -96.63%
Formula
Percentage change = [(17 - 505) / 505] x 100
Subtract the new number by the original number
17 - 505 = -488
-488 ÷ 505 = -0.9663366336633663
-0.9663366336633663 x 100 = -96.63%