291.81% is the change from 171 to 670
Calculation steps:
[( 670 - 171 ) ÷ 171] x 100 = 291.81%
Formula
Percentage change = [(670 - 171) / 171] x 100
Subtract the new number by the original number
670 - 171 = 499
499 ÷ 171 = 2.91812865497076
2.91812865497076 x 100 = 291.81%