-46.26% is the change from 521 to 280
Calculation steps:
[( 280 - 521 ) ÷ 521] x 100 = -46.26%
Formula
Percentage change = [(280 - 521) / 521] x 100
Subtract the new number by the original number
280 - 521 = -241
-241 ÷ 521 = -0.46257197696737046
-0.46257197696737046 x 100 = -46.26%