38.17% is the change from 131 to 181
Calculation steps:
[( 181 - 131 ) ÷ 131] x 100 = 38.17%
Formula
Percentage change = [(181 - 131) / 131] x 100
Subtract the new number by the original number
181 - 131 = 50
50 ÷ 131 = 0.3816793893129771
0.3816793893129771 x 100 = 38.17%