Ken and Belinda have a five-year-old daughter. At the end of every six months for the next 12^1/2 years, they wish to contribute equal amounts to a Registered Education Savings Plan (RESP). Six months after the last RESP contribution, the first of 12 semiannual withdrawals of $6300 will be made. If the RESP earns 9.8% compounded semiannually, what must be the size of their regular RESP contributions?