-50.39% is the change from 516 to 256
Calculation steps:
[( 256 - 516 ) ÷ 516] x 100 = -50.39%
Formula
Percentage change = [(256 - 516) / 516] x 100
Subtract the new number by the original number
256 - 516 = -260
-260 ÷ 516 = -0.5038759689922481
-0.5038759689922481 x 100 = -50.39%