2.25% is the change from 89 to 91
Calculation steps:
[( 91 - 89 ) ÷ 89] x 100 = 2.25%
Formula
Percentage change = [(91 - 89) / 89] x 100
Subtract the new number by the original number
91 - 89 = 2
2 ÷ 89 = 0.02247191011235955
0.02247191011235955 x 100 = 2.25%