-6.47% is the change from 834 to 780
Calculation steps:
[( 780 - 834 ) ÷ 834] x 100 = -6.47%
Formula
Percentage change = [(780 - 834) / 834] x 100
Subtract the new number by the original number
780 - 834 = -54
-54 ÷ 834 = -0.06474820143884892
-0.06474820143884892 x 100 = -6.47%