-98.08% is the change from 520 to 10
Calculation steps:
[( 10 - 520 ) ÷ 520] x 100 = -98.08%
Formula
Percentage change = [(10 - 520) / 520] x 100
Subtract the new number by the original number
10 - 520 = -510
-510 ÷ 520 = -0.9807692307692307
-0.9807692307692307 x 100 = -98.08%