-94.63% is the change from 521 to 28
Calculation steps:
[( 28 - 521 ) ÷ 521] x 100 = -94.63%
Formula
Percentage change = [(28 - 521) / 521] x 100
Subtract the new number by the original number
28 - 521 = -493
-493 ÷ 521 = -0.946257197696737
-0.946257197696737 x 100 = -94.63%