A group of private investors borrowed $33,716,548million to build 300 new luxury apartments near a large university. The money was borrowed at 6% 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 $4,927 per apartment. This expense will be incurred even if an apartment is vacant. The rental fee for each apartment will be $13,344 per year, and the worst case occupancy rate is projected to be 87%. Investigate the sensitivity of annual profit (or loss) to changes in occupancy rate. Express your answer in percent rounded to the nearest hundedths.