-56.84% is the change from 512 to 221
Calculation steps:
[( 221 - 512 ) ÷ 512] x 100 = -56.84%
Formula
Percentage change = [(221 - 512) / 512] x 100
Subtract the new number by the original number
221 - 512 = -291
-291 ÷ 512 = -0.568359375
-0.568359375 x 100 = -56.84%