-93.89% is the change from 507 to 31
Calculation steps:
[( 31 - 507 ) ÷ 507] x 100 = -93.89%
Formula
Percentage change = [(31 - 507) / 507] x 100
Subtract the new number by the original number
31 - 507 = -476
-476 ÷ 507 = -0.9388560157790927
-0.9388560157790927 x 100 = -93.89%