19.8% is the change from 101 to 121
Calculation steps:
[( 121 - 101 ) ÷ 101] x 100 = 19.8%
Formula
Percentage change = [(121 - 101) / 101] x 100
Subtract the new number by the original number
121 - 101 = 20
20 ÷ 101 = 0.19801980198019803
0.19801980198019803 x 100 = 19.8%