438.6% is the change from 171 to 921
Calculation steps:
[( 921 - 171 ) ÷ 171] x 100 = 438.6%
Formula
Percentage change = [(921 - 171) / 171] x 100
Subtract the new number by the original number
921 - 171 = 750
750 ÷ 171 = 4.385964912280702
4.385964912280702 x 100 = 438.6%