5% is the change from 180 to 189
Calculation steps:
[( 189 - 180 ) ÷ 180] x 100 = 5%
Formula
Percentage change = [(189 - 180) / 180] x 100
Subtract the new number by the original number
189 - 180 = 9
9 ÷ 180 = 0.05
0.05 x 100 = 5%
Example