-66.41% is the change from 512 to 172
Calculation steps:
[( 172 - 512 ) ÷ 512] x 100 = -66.41%
Formula
Percentage change = [(172 - 512) / 512] x 100
Subtract the new number by the original number
172 - 512 = -340
-340 ÷ 512 = -0.6640625
-0.6640625 x 100 = -66.41%