13. You own an apartment house that provides a net income to you of $2000 per month. What is the maximum 20-year mortgage loan you could obtain such that the payments on the loan could be made entirely from the apartment income? Assume a 9% annual interest rate (0.75% per month) and monthly payments on the mortgage. Georg Clever, who lives in Chicago, received an offer in the main to invest $5000 in a Mexican bank savings account which pays 25% annual interest in pesos. The account permits no withdrawals for 4 years and is guaranteed by the Mexican government. At current exchange rates, $5000 will exchange into 15 million Mexican pesos. If George invests the money today, how many pesos would he receive 4 years from now? Do you see any exchange rate problems with this opportunity