@KunjiBoy: $46905 for boarding, tuition only. $36430 for day, tuition only. http://exeter.edu/admissions/109_1370.aspx.
46.3% of the student body is on financial aid and the average grant is “$40,559 plus $850 that all financial aid recipients receive toward the cost of books and supplies, for an effective average award of $41,409 (which covers more than 86 percent of tuition and fees).”
Tuition is free for those with an income of $75k or below.