-85.32% is the change from 511 to 75
Calculation steps:
[( 75 - 511 ) ÷ 511] x 100 = -85.32%
Formula
Percentage change = [(75 - 511) / 511] x 100
Subtract the new number by the original number
75 - 511 = -436
-436 ÷ 511 = -0.8532289628180039
-0.8532289628180039 x 100 = -85.32%