-77.88% is the change from 520 to 115
Calculation steps:
[( 115 - 520 ) ÷ 520] x 100 = -77.88%
Formula
Percentage change = [(115 - 520) / 520] x 100
Subtract the new number by the original number
115 - 520 = -405
-405 ÷ 520 = -0.7788461538461539
-0.7788461538461539 x 100 = -77.88%