-80.19% is the change from 515 to 102
Calculation steps:
[( 102 - 515 ) ÷ 515] x 100 = -80.19%
Formula
Percentage change = [(102 - 515) / 515] x 100
Subtract the new number by the original number
102 - 515 = -413
-413 ÷ 515 = -0.8019417475728156
-0.8019417475728156 x 100 = -80.19%