It is known that mean yearly healthcare costs for a family of four are normally distributed with a mean of $3,300 and a standard deviation of $500. The insurance company has offered to offer reductions in healthcare premiums if the health expenses for a family do not exceed a certain amount per year. What should the highest expense amount that is eligible for the premium reduction be set to if company wants to offer the reduction to those families that have the lowest 25 percent of yearly expenses?