-48.8% is the change from 1000 to 512
Calculation steps:
[( 512 - 1000 ) ÷ 1000] x 100 = -48.8%
Formula
Percentage change = [(512 - 1000) / 1000] x 100
Subtract the new number by the original number
512 - 1000 = -488
-488 ÷ 1000 = -0.488
-0.488 x 100 = -48.8%