-52.73% is the change from 512 to 242
Calculation steps:
[( 242 - 512 ) ÷ 512] x 100 = -52.73%
Formula
Percentage change = [(242 - 512) / 512] x 100
Subtract the new number by the original number
242 - 512 = -270
-270 ÷ 512 = -0.52734375
-0.52734375 x 100 = -52.73%