-56.24% is the change from 505 to 221
Calculation steps:
[( 221 - 505 ) ÷ 505] x 100 = -56.24%
Formula
Percentage change = [(221 - 505) / 505] x 100
Subtract the new number by the original number
221 - 505 = -284
-284 ÷ 505 = -0.5623762376237624
-0.5623762376237624 x 100 = -56.24%