A couple is planning to finance its three$-$year$-$old son's university education. Money can be deposited at $11\%$

compounded quarterly. What quarterly deposit must be made from the son's $3$rd birthday to his $18$th

birthday to provide $$9000$ on each birthday from the $18$th to the $21$st$?($Note that the first deposit is made

three months after the $3$rd birthday and the last deposit is made on the date of the first withdrawal.$)$

$($keep $2$ decimal places$)$

Answer: