Renee operates a proprietorship selling collectibles over the web, and last year she purchased a building for $24 million for her business. In 2021, Renees proprietorship reported revenue of $84 million and incurred total expenses of $77.6 million. Her expenses included cost of goods sold of $48.5 million, sales commissions paid of $6.9 million, $9.5 million of interest paid on the building mortgage, and $12.7 million of depreciation. What is the maximum amount of business interest expense that Renee can deduct this year?