-9.09% is the change from 770 to 700
Calculation steps:
[( 700 - 770 ) ÷ 770] x 100 = -9.09%
Formula
Percentage change = [(700 - 770) / 770] x 100
Subtract the new number by the original number
700 - 770 = -70
-70 ÷ 770 = -0.09090909090909091
-0.09090909090909091 x 100 = -9.09%