-84.47% is the change from 515 to 80
Calculation steps:
[( 80 - 515 ) ÷ 515] x 100 = -84.47%
Formula
Percentage change = [(80 - 515) / 515] x 100
Subtract the new number by the original number
80 - 515 = -435
-435 ÷ 515 = -0.8446601941747572
-0.8446601941747572 x 100 = -84.47%