How do I solve this problem?

ATIRR. You can buy a building for $1,000 and sell it after 10 years for $1,100. (NOI = 70; Annual Depreciation = $50; Ordinary Tax Rate = 40%: Depreciation Recapture Tax = 30%; Capital Gain Tax=20%) What is the After Tax Rate of Return? Selected Answer 5.66% Answers: 5.66% 5.01% 5.36% 5.84% 6.05% 6.33% 6.77% 7.00%