-77.78% is the change from 9 to 2
Calculation steps:
[( 2 - 9 ) ÷ 9] x 100 = -77.78%
Formula
Percentage change = [(2 - 9) / 9] x 100
Subtract the new number by the original number
2 - 9 = -7
-7 ÷ 9 = -0.7777777777777778
-0.7777777777777778 x 100 = -77.78%