-55.66% is the change from 521 to 231
Calculation steps:
[( 231 - 521 ) ÷ 521] x 100 = -55.66%
Formula
Percentage change = [(231 - 521) / 521] x 100
Subtract the new number by the original number
231 - 521 = -290
-290 ÷ 521 = -0.5566218809980806
-0.5566218809980806 x 100 = -55.66%