Donna Clark owns Pharoah, an educational tutoring center in Greenville, South Carolina. The center offers private tutoring in math, writing, and science. Information about the tutoring sessions is as follows: Math Writing $50 Science $22 $32 14 30 10 Session price Variable labor costs Variable supplies cost Session length Number of sessions demanded per week 3 2 1 60 minutes 180 90 minutes 260 30 minutes 120 Since the company opened five years ago, demand has grown faster than the supply of qualified tutors. Donna currently has enough tutors to provide only 420 hours of tutoring each week. (a1) Calculate the total number of hours demanded per week. (Round answers to 0 decimal places, e.g. 5,275.) Hours needed Math Writing Science Total