-34.69% is the change from 784 to 512
Calculation steps:
[( 512 - 784 ) ÷ 784] x 100 = -34.69%
Formula
Percentage change = [(512 - 784) / 784] x 100
Subtract the new number by the original number
512 - 784 = -272
-272 ÷ 784 = -0.3469387755102041
-0.3469387755102041 x 100 = -34.69%