37.88% is the change from 66 to 91
Calculation steps:
[( 91 - 66 ) ÷ 66] x 100 = 37.88%
Formula
Percentage change = [(91 - 66) / 66] x 100
Subtract the new number by the original number
91 - 66 = 25
25 ÷ 66 = 0.3787878787878788
0.3787878787878788 x 100 = 37.88%