50% is the change from 6 to 9
Calculation steps:
[( 9 - 6 ) ÷ 6] x 100 = 50%
Formula
Percentage change = [(9 - 6) / 6] x 100
Subtract the new number by the original number
9 - 6 = 3
3 ÷ 6 = 0.5
0.5 x 100 = 50%
Example