-29.49% is the change from 780 to 550
Calculation steps:
[( 550 - 780 ) ÷ 780] x 100 = -29.49%
Formula
Percentage change = [(550 - 780) / 780] x 100
Subtract the new number by the original number
550 - 780 = -230
-230 ÷ 780 = -0.2948717948717949
-0.2948717948717949 x 100 = -29.49%