please explain why this is the answer

x O out of 2 points BTIRR. You can buy the City Select building for $8,000,000 that has fixed leases in place for a least the next 7 years providing a constant NOI of $600,000 and you sell after 7 years for a net sale price of $10,000,000. What is the BTIRR? Selected Answer: 11.96% Answers: 10.13% 10.77% 11.96% 12.61% 13.31% 16.56%