-75.2% is the change from 512 to 127
Calculation steps:
[( 127 - 512 ) ÷ 512] x 100 = -75.2%
Formula
Percentage change = [(127 - 512) / 512] x 100
Subtract the new number by the original number
127 - 512 = -385
-385 ÷ 512 = -0.751953125
-0.751953125 x 100 = -75.2%