-87.97% is the change from 507 to 61
Calculation steps:
[( 61 - 507 ) ÷ 507] x 100 = -87.97%
Formula
Percentage change = [(61 - 507) / 507] x 100
Subtract the new number by the original number
61 - 507 = -446
-446 ÷ 507 = -0.8796844181459567
-0.8796844181459567 x 100 = -87.97%