-92.35% is the change from 510 to 39
Calculation steps:
[( 39 - 510 ) ÷ 510] x 100 = -92.35%
Formula
Percentage change = [(39 - 510) / 510] x 100
Subtract the new number by the original number
39 - 510 = -471
-471 ÷ 510 = -0.9235294117647059
-0.9235294117647059 x 100 = -92.35%