-53.55% is the change from 521 to 242
Calculation steps:
[( 242 - 521 ) ÷ 521] x 100 = -53.55%
Formula
Percentage change = [(242 - 521) / 521] x 100
Subtract the new number by the original number
242 - 521 = -279
-279 ÷ 521 = -0.5355086372360844
-0.5355086372360844 x 100 = -53.55%