Sam and Sue wants to provide full funding for their 3 year old daughter who is expected to start college when she is 18. The current annual cost of a 4 year college is $38,000 which is expected to increase by 3.5% per year. Sam and Sue expect to earn 4.5% on their investment. They have already saved $13,000 in a college fund for this purpose. Calculate the additional amount they should save by the end of every year in order to accumulate funding for 4 years of college when their daughter turns 18.