A couple recently married is considering the purchase of a $250,000 home. They have no savings of their own and are contemplating funding the cost through a combination of three sources: a loan from other family members of $10,000 at 2% interest, a first mortgage of $200,000 at 4% interest, and a second mortgage of $40,000 at 8% interest. Calculate the overall rate of interest the couple will pay using this arrangement. If you answer using a percent, please include a minimum of two significant digits in your answer. If you answer using a decimal, please include a minimum of four significant digits in your answer.