man wants to help provide college education for his daughter. He can afford to invest $600/yr for the next 4 years, beginning on the girl's 4th birthday, he wishes to give his daughter $4000 on her 18th 19th 20th and 21th birthdays, for a total of $16000, assuming 5% interest, what uniform annual investment will he have to make on the girl's 8th through 17th birthdays?