-98.04% is the change from 510 to 10
Calculation steps:
[( 10 - 510 ) ÷ 510] x 100 = -98.04%
Formula
Percentage change = [(10 - 510) / 510] x 100
Subtract the new number by the original number
10 - 510 = -500
-500 ÷ 510 = -0.9803921568627451
-0.9803921568627451 x 100 = -98.04%