-34.49% is the change from 780 to 511
Calculation steps:
[( 511 - 780 ) ÷ 780] x 100 = -34.49%
Formula
Percentage change = [(511 - 780) / 780] x 100
Subtract the new number by the original number
511 - 780 = -269
-269 ÷ 780 = -0.34487179487179487
-0.34487179487179487 x 100 = -34.49%