42.15% is the change from 121 to 172
Calculation steps:
[( 172 - 121 ) ÷ 121] x 100 = 42.15%
Formula
Percentage change = [(172 - 121) / 121] x 100
Subtract the new number by the original number
172 - 121 = 51
51 ÷ 121 = 0.4214876033057851
0.4214876033057851 x 100 = 42.15%