Mr. \& Mrs. Jones seek to purchase a yacht in 8 years time when they retire to sail the Caribbean. They are planning to purchase the boat using proceeds from the sale of their property which is currently worth $500,000 and its value is growing at 7 percent a year. The yacht is currently worth $700,000 and it's value will increase at a rate of 5 percent per year over the next 8 years. In addition to the value of their property, how much additional money should they deposit at the end of each year in an account paying 9 percent annual interest in order to be able to buy the boat upon retirement