-77.54% is the change from 512 to 115
Calculation steps:
[( 115 - 512 ) ÷ 512] x 100 = -77.54%
Formula
Percentage change = [(115 - 512) / 512] x 100
Subtract the new number by the original number
115 - 512 = -397
-397 ÷ 512 = -0.775390625
-0.775390625 x 100 = -77.54%