Let $f(t)$ Be the Number of Men And $g(t)$ Be the Number of Women Residing in a Certain Town

Let $f(t)$ be the number of men and $g(t)$ be the number of women residing in a certain town in year $t$ . Let $h(t)$ be the average income, in dollars, of residents of that town in year $t$ . If $f(t)=250+8 t, g(t)=275+5 t$ , and $h(t)=32,000+100 t$ , find a simplified formula for the total amount of money earned by all adult residents of the town in year $t$ .