-63.9% is the change from 770 to 278
Calculation steps:
[( 278 - 770 ) ÷ 770] x 100 = -63.9%
Formula
Percentage change = [(278 - 770) / 770] x 100
Subtract the new number by the original number
278 - 770 = -492
-492 ÷ 770 = -0.638961038961039
-0.638961038961039 x 100 = -63.9%