A couple is planning to finance its three$-$year$-$old son's university education. Money can be deposited at $9\%$ compounded quarterly. What quarterly deposit must be made from

the son's $3$rd birthday to his $18$ th birthday to provide $$10000$ on each birthday from the $18$ th to the $21$ st$?($Note that the first deposit is made three months after the $3$ birthday

and the last deposit is made on the date of the first withdrawal.$)$