Abe will need $18,000 per year for four years to pay for tuition. How much will Abe's parents have to invest at the end of each year for the 8 years before he begins his studies if their savings earn compound interest at 5 percent per year? Assume the tuition payments occur at the end of each year. (Round answer to 2 decimal places, e.g. 125.12. Do not round your intermediate calculations.) Annual savings $