-82.25% is the change from 507 to 90
Calculation steps:
[( 90 - 507 ) ÷ 507] x 100 = -82.25%
Formula
Percentage change = [(90 - 507) / 507] x 100
Subtract the new number by the original number
90 - 507 = -417
-417 ÷ 507 = -0.8224852071005917
-0.8224852071005917 x 100 = -82.25%