310.56% is the change from 161 to 661
Calculation steps:
[( 661 - 161 ) ÷ 161] x 100 = 310.56%
Formula
Percentage change = [(661 - 161) / 161] x 100
Subtract the new number by the original number
661 - 161 = 500
500 ÷ 161 = 3.1055900621118013
3.1055900621118013 x 100 = 310.56%