-81.94% is the change from 515 to 93
Calculation steps:
[( 93 - 515 ) ÷ 515] x 100 = -81.94%
Formula
Percentage change = [(93 - 515) / 515] x 100
Subtract the new number by the original number
93 - 515 = -422
-422 ÷ 515 = -0.8194174757281554
-0.8194174757281554 x 100 = -81.94%