-66.8% is the change from 512 to 170
Calculation steps:
[( 170 - 512 ) ÷ 512] x 100 = -66.8%
Formula
Percentage change = [(170 - 512) / 512] x 100
Subtract the new number by the original number
170 - 512 = -342
-342 ÷ 512 = -0.66796875
-0.66796875 x 100 = -66.8%