Medical Costs for a Family of Four
The average annual medical costs for a family of four in the United States from 2001 through 2011 is approximated by the function
c(t) = 22.9883t² + 830.358t + 7513 (0 < t < 11), where t is measured in years with t = 1 corresponding to 2001, and C(t) is measured in dollars. What was the approximate average annual medical costs for a family of four in 2005? (Round your answer to two decimal places.)