Hal, an Austin native, purchases a home in Texas for $200,000 in 1985. He pays $40,000 as a down payment. Between 1985 and 1995, Hal paid an additional $40,000 against the principal $200,000 purchase price. In 1995 Hal marries Wanda, a former Miss Texas. After the marriage, all subsequent payments are made with checks drawn from their joint bank account. Hal and Wanda make the final payment on the house in 2005. In 2006, Hal and Wanda retire and sell the house for $2,000,000. Hal dies the next day. What is the interest of Hal's estate in the proceeds? a. $1,080,000 b. $1,040,000 c. $1,000,000 d. $960,000