need help with this

. A decision at the margin Rina is a hard-working college senior One Thursday, she decides to work nonstop until she bas answer chemistry course. She starts work at 8:00 AM and uses a table to keep track of her progress throughou tired, it takes her longer to solve each problen Time Total Problems Answered 9:00 AM 10 0 15:00 AN 175 11:09 AM 225 250 Use the table to answer the inkewhy questions, The marcinal, or additional gam iron Pine's first hour of work, from $:80 OM to 9:00 AM, Is Image problems. The marginal gain from Rina's third hour of work from 10:30 AM wind ob AM is the problems Later, the teaching assistant in Ring's chemistry course olves her some advice. "Based on past experience : the working on 37.5 problems raises a student's exam score by about the same amount as reading the testhook students always cover the same number of pages during each hour they spend reading Given this information, in order to use here hours of study time to get the best axain store possible, how many working on problems, and how many should sho have spent reading? B nour's working on problems, 4 hours reading 2 hours working on problems, 2 hours reading 3 hours working on problems, 1 hour reading 4 hours working on problems, U hours reading O