Mary wants to help pay for her granddaughter Beth's education. She has decided to pay for half of the tuition costs at State University, which are now $11,000 per year. Tuituin is expected to increase at a rate of 7% per year into the forseeable future. Beth just had her 12th birthday. Beth plans to start college on her 18th birthday and finish in four years. Mary will make a deposit today and continue making deposits each year until Beth starts college. The account will earn 4% interest, compounded annually. How much must Mary's deposits be each year in order to pay half of Beth's tuition at the beginning of each school year?