-83.63% is the change from 507 to 83
Calculation steps:
[( 83 - 507 ) ÷ 507] x 100 = -83.63%
Formula
Percentage change = [(83 - 507) / 507] x 100
Subtract the new number by the original number
83 - 507 = -424
-424 ÷ 507 = -0.8362919132149902
-0.8362919132149902 x 100 = -83.63%