-83.43% is the change from 513 to 85
Calculation steps:
[( 85 - 513 ) ÷ 513] x 100 = -83.43%
Formula
Percentage change = [(85 - 513) / 513] x 100
Subtract the new number by the original number
85 - 513 = -428
-428 ÷ 513 = -0.834307992202729
-0.834307992202729 x 100 = -83.43%