Need help with question 12, THANKS

QUESTION 11 You are an investor assessing the REIT Public Storage's financial situation. You observe that it has Operating Revenues (Rents) of $1,700,000,000.00 (1.7 Billion) dollars and Operating Costs (Mostly Utilities and Administration) of $800,000,000.00. What is its NO1? 900,000,000 QUESTION 12 Same set-up at Question 11. Once you've calculated Public Storage's NOl, your investment team has decided that the Cap Rate for commercial buildings intended for storage is 8%. What is Public Storage's NAV