Javier and Anita Sanchez purchased a home on January $1,2023,$ for $$600,000$ by paying $$200,000$ down and borrowing the remaining $$400,000$ with a $7$ percent loan secured by the home. The loan requires interest$-$only payments for the first five years. The Sanchezes would itemize deductions even if they did not have any deductible interest. The Sanchezes' marginal tax rate is $32$ percent.

b$.$ Assume the original facts, except that the Sanchezes rent a home and pay $$21,000$ in rent during the year. What is the after$-$tax cost of their rental payments in $2023?$