-92.03% is the change from 502 to 40
Calculation steps:
[( 40 - 502 ) ÷ 502] x 100 = -92.03%
Formula
Percentage change = [(40 - 502) / 502] x 100
Subtract the new number by the original number
40 - 502 = -462
-462 ÷ 502 = -0.9203187250996016
-0.9203187250996016 x 100 = -92.03%