The population of a town increases 4 % annually but is decreased by emigration annually to the extent of (1/2) %. What will be the increase percent in three years?

A. 6%
B. 5%
C. 7%
D. 8%
1. To find the interest, subtract the principal from the balance.
$618 – $600 = $18
2.Use the simple interest formula and solve for r.
I = Prt
18= 600 x r x (1/2)
r= 0.06 =6%