-34.36% is the change from 780 to 512
Calculation steps:
[( 512 - 780 ) ÷ 780] x 100 = -34.36%
Formula
Percentage change = [(512 - 780) / 780] x 100
Subtract the new number by the original number
512 - 780 = -268
-268 ÷ 780 = -0.3435897435897436
-0.3435897435897436 x 100 = -34.36%