-97.88% is the change from 520 to 11
Calculation steps:
[( 11 - 520 ) ÷ 520] x 100 = -97.88%
Formula
Percentage change = [(11 - 520) / 520] x 100
Subtract the new number by the original number
11 - 520 = -509
-509 ÷ 520 = -0.9788461538461538
-0.9788461538461538 x 100 = -97.88%