121.95% is the change from 41 to 91
Calculation steps:
[( 91 - 41 ) ÷ 41] x 100 = 121.95%
Formula
Percentage change = [(91 - 41) / 41] x 100
Subtract the new number by the original number
91 - 41 = 50
50 ÷ 41 = 1.2195121951219512
1.2195121951219512 x 100 = 121.95%