-85.35% is the change from 512 to 75
Calculation steps:
[( 75 - 512 ) ÷ 512] x 100 = -85.35%
Formula
Percentage change = [(75 - 512) / 512] x 100
Subtract the new number by the original number
75 - 512 = -437
-437 ÷ 512 = -0.853515625
-0.853515625 x 100 = -85.35%