-77.06% is the change from 340 to 78
Calculation steps:
[( 78 - 340 ) ÷ 340] x 100 = -77.06%
Formula
Percentage change = [(78 - 340) / 340] x 100
Subtract the new number by the original number
78 - 340 = -262
-262 ÷ 340 = -0.7705882352941177
-0.7705882352941177 x 100 = -77.06%