-82.94% is the change from 510 to 87
Calculation steps:
[( 87 - 510 ) ÷ 510] x 100 = -82.94%
Formula
Percentage change = [(87 - 510) / 510] x 100
Subtract the new number by the original number
87 - 510 = -423
-423 ÷ 510 = -0.8294117647058824
-0.8294117647058824 x 100 = -82.94%