Bill and Cathy will be retiring in fifteen years and would like to buy an Italian villa. The villa costs $500,000 today, and housing prices in Italy are expected to increase by 6.5% per year. Bill and Cathy wants to deposit one lump sum amount today. If their account earns 10% per year, what is the amount of this deposit? - Please show step by step explination. I got the answer, but need steps.