-77% is the change from 500 to 115
Calculation steps:
[( 115 - 500 ) ÷ 500] x 100 = -77%
Formula
Percentage change = [(115 - 500) / 500] x 100
Subtract the new number by the original number
115 - 500 = -385
-385 ÷ 500 = -0.77
-0.77 x 100 = -77%
Example