-97.85% is the change from 511 to 11
Calculation steps:
[( 11 - 511 ) ÷ 511] x 100 = -97.85%
Formula
Percentage change = [(11 - 511) / 511] x 100
Subtract the new number by the original number
11 - 511 = -500
-500 ÷ 511 = -0.9784735812133072
-0.9784735812133072 x 100 = -97.85%