-83.87% is the change from 527 to 85
Calculation steps:
[( 85 - 527 ) ÷ 527] x 100 = -83.87%
Formula
Percentage change = [(85 - 527) / 527] x 100
Subtract the new number by the original number
85 - 527 = -442
-442 ÷ 527 = -0.8387096774193549
-0.8387096774193549 x 100 = -83.87%