I could use some help with this question- thanks in advance!!

18. Suppose studying today comes at a cost of -12 utils. The benefit, in terms of class performance, 8 utils per day for each of the following three days. For example, if you study on Sunday, you get an immediate cost of 12 utils, and an 8 util benefit on Monday, 8 utils on Tuesday, and 8 utils on Wednesday. Suppose your daily delta = .8. If today is Monday, do you plan to study on Tuesday (show your work)? What range of values for beta guarantee that your plan to study is time consistent (that is, that you follow through with your plan when Tuesday comes)? 8 points