1. A group of private investors borrowed $30,053,950million to build 300 new luxury apartments near a large university. The money was borrowed at 5% annual interest, and the loan is to be repaid in equal annual amounts over a 40-year period. Annual operating and maintenance expenses are estimated to be $5,202 per apartment. This expense will be incurred even if an apartment is vacant. The rental fee for each apartment will be $14,241 per year, and the worst case occupancy rate is projected to be 89%. Investigate the sensitivity of annual profit (or loss) to changes in annual operating and maintenance expense.