-57.62% is the change from 512 to 217
Calculation steps:
[( 217 - 512 ) ÷ 512] x 100 = -57.62%
Formula
Percentage change = [(217 - 512) / 512] x 100
Subtract the new number by the original number
217 - 512 = -295
-295 ÷ 512 = -0.576171875
-0.576171875 x 100 = -57.62%