-92.31% is the change from 507 to 39
Calculation steps:
[( 39 - 507 ) ÷ 507] x 100 = -92.31%
Formula
Percentage change = [(39 - 507) / 507] x 100
Subtract the new number by the original number
39 - 507 = -468
-468 ÷ 507 = -0.9230769230769231
-0.9230769230769231 x 100 = -92.31%