You have been accepted at University. You will need $15,000 every six months (beginning six months from now) for the next four years to cover tuition and living expenses. Mom and Dad have agreed to pay for your education. They want to make one deposit now in a bank account earning 10% interest, compounded semiannually, so that you can withdraw $15,000 every six months for the next four years. How much must they deposit now?