39.08% is the change from 87 to 121
Calculation steps:
[( 121 - 87 ) ÷ 87] x 100 = 39.08%
Formula
Percentage change = [(121 - 87) / 87] x 100
Subtract the new number by the original number
121 - 87 = 34
34 ÷ 87 = 0.39080459770114945
0.39080459770114945 x 100 = 39.08%