-89.84% is the change from 502 to 51
Calculation steps:
[( 51 - 502 ) ÷ 502] x 100 = -89.84%
Formula
Percentage change = [(51 - 502) / 502] x 100
Subtract the new number by the original number
51 - 502 = -451
-451 ÷ 502 = -0.898406374501992
-0.898406374501992 x 100 = -89.84%