-21.43% is the change from 980 to 770
Calculation steps:
[( 770 - 980 ) ÷ 980] x 100 = -21.43%
Formula
Percentage change = [(770 - 980) / 980] x 100
Subtract the new number by the original number
770 - 980 = -210
-210 ÷ 980 = -0.21428571428571427
-0.21428571428571427 x 100 = -21.43%