-76.35% is the change from 520 to 123
Calculation steps:
[( 123 - 520 ) ÷ 520] x 100 = -76.35%
Formula
Percentage change = [(123 - 520) / 520] x 100
Subtract the new number by the original number
123 - 520 = -397
-397 ÷ 520 = -0.7634615384615384
-0.7634615384615384 x 100 = -76.35%