Question $6(2\mathrm{.}5$ pt$)$: A man wants to help provide a college education for his young daughter. He can afford to invest $$600/$year for the next $4$ years, beginning on the girl's $4$th birthday. He wishes to give his daughter $$4,000$ on her $18$th$,19$th$,20$th and $21$th birthdays, for a total of $$16,000.$ Assuming a $5\%$ interest rate, what uniform annual investment will he have to make on the girl's $8$th through $17$th birthday?