-85.74% is the change from 512 to 73
Calculation steps:
[( 73 - 512 ) ÷ 512] x 100 = -85.74%
Formula
Percentage change = [(73 - 512) / 512] x 100
Subtract the new number by the original number
73 - 512 = -439
-439 ÷ 512 = -0.857421875
-0.857421875 x 100 = -85.74%