Joan, a new contact, is describing her business to you. as you listen, what should you be thinking about? a. whether or not shes likely to send you any referrals. b. how soon to move on to the next person. c. what youre going to say next d. what kind of you can offer her.

answer: marginal utility of the fourth brownie is 0.

explanation: marginal utility is the addtional utility gained from the consumption of one more unit of a good. it is given by,

so, marginal utility at the 4th unit will be given by

since, the values are not given here, you can simply find marginal utility at fourth unit by subtracting total utility at 3rd unit from total utility at 4th unit.