-83.1% is the change from 503 to 85
Calculation steps:
[( 85 - 503 ) ÷ 503] x 100 = -83.1%
Formula
Percentage change = [(85 - 503) / 503] x 100
Subtract the new number by the original number
85 - 503 = -418
-418 ÷ 503 = -0.831013916500994
-0.831013916500994 x 100 = -83.1%