Today you have decided to elaborate a plan for your personal finances. You expect to have an expense of 31,112 dollars one year from now, a receivable of 19,231 dollars two years from now, and an expense of 18,049 dollars three years from now. How much money do you need to deposit today in order to honor these future financial obligations if your savings account yields 7 % per year? Only a single deposit today is allowed; no other options are available.