We will have the following:
Assumin it is compounded once each year, we will first determine the total to be paid each year overall:
[tex]18000000=P(1+\frac{0.027}{1})^{1\cdot30}\Rightarrow P=\frac{18000000}{(1+0.027)^{30}}[/tex][tex]\Rightarrow P=8093925.398[/tex]Now, we simply divide by the total number of families and we determine the amount of money each family will pay:
[tex]=P_f=\frac{8093925.398}{17000}\Rightarrow P_f=476.1132587\ldots[/tex][tex]\Rightarrow P_f=476.1[/tex]So, each famiy will pay approximately $476.11 each year.