311.9% is the change from 42 to 173
Calculation steps:
[( 173 - 42 ) ÷ 42] x 100 = 311.9%
Formula
Percentage change = [(173 - 42) / 42] x 100
Subtract the new number by the original number
173 - 42 = 131
131 ÷ 42 = 3.119047619047619
3.119047619047619 x 100 = 311.9%
Example