-53.93% is the change from 521 to 240
Calculation steps:
[( 240 - 521 ) ÷ 521] x 100 = -53.93%
Formula
Percentage change = [(240 - 521) / 521] x 100
Subtract the new number by the original number
240 - 521 = -281
-281 ÷ 521 = -0.5393474088291746
-0.5393474088291746 x 100 = -53.93%