please help.

I need help solving (d1)? Susan Shi owns TestTutor, 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 Science Session price $34 $50 $25 Variable labor costs 20 30 10 Variable supplies cost 2 2 Session length 45 minutes 90 minutes 30 minutes Number of sessions demanded per week 180 260 120 Since the company opened five years ago, demand has grown faster than the supply of qualified tutors. Susan currently has enough tutors to provide only 420 hours of tutoring each week. (a1) Your answer is correct. Calculate the total number of hours demanded per week. (Round answers to O decimal places, e.g. 5,275.) Hours needed Math 135 Writing 390 Science Total 585 eTextbook and Media Attempts: 2 of 3 used Using multiple attempts will impact your score. 20% score reduction after attempt 2(b) Your answer is correct. How should Susan allocate the currently available tutor hours? (Round answers to O decimal places, e.g. 5,275.) Hours used Math 135 Writing 225 Science 60 eTextbook and Media Attempts: 2 of 3 used Using multiple attempts will impact your score. 20% score reduction after attempt 2 Your Answer Correct Answer (Used) What total contribution margin will Susan earn based on your answer to (b)? Contribution margin $ 6,540 (d1) Susan has decided that instead of offering individualized instruction in math and science, she will switch to group sessions. Each math session will accommodate two students, and each science session will accommodate four students. Each student in the group will continue to pay the original session price. All sessions will have a single tutor, but each student will need supplies. Calculate the total hours needed with the group sessions. (Round answers to 2 decimal place, eg. 15.25.) Hours needed Math Writing Science Total