-83.88% is the change from 515 to 83
Calculation steps:
[( 83 - 515 ) ÷ 515] x 100 = -83.88%
Formula
Percentage change = [(83 - 515) / 515] x 100
Subtract the new number by the original number
83 - 515 = -432
-432 ÷ 515 = -0.8388349514563107
-0.8388349514563107 x 100 = -83.88%