-85.1% is the change from 510 to 76
Calculation steps:
[( 76 - 510 ) ÷ 510] x 100 = -85.1%
Formula
Percentage change = [(76 - 510) / 510] x 100
Subtract the new number by the original number
76 - 510 = -434
-434 ÷ 510 = -0.8509803921568627
-0.8509803921568627 x 100 = -85.1%