-81.19% is the change from 521 to 98
Calculation steps:
[( 98 - 521 ) ÷ 521] x 100 = -81.19%
Formula
Percentage change = [(98 - 521) / 521] x 100
Subtract the new number by the original number
98 - 521 = -423
-423 ÷ 521 = -0.8119001919385797
-0.8119001919385797 x 100 = -81.19%