-55.84% is the change from 770 to 340
Calculation steps:
[( 340 - 770 ) ÷ 770] x 100 = -55.84%
Formula
Percentage change = [(340 - 770) / 770] x 100
Subtract the new number by the original number
340 - 770 = -430
-430 ÷ 770 = -0.5584415584415584
-0.5584415584415584 x 100 = -55.84%