bill and cathy built a new home in 1985 at a cost of $90,000.00. they paid 20% of the cost to build the home themselves and financed the remainder by way of a mortgage. they paid the mortgage off in 15 years. they used $35,000 from bill's inheritance to upgrade the home in 2004. when they sold the home for $335,000.00 in 2006, what was the value of their equity?