Country a can produce, at most, 40 olives or 20 pickles, or some combination of olives and pickles such as the 20 olives and 10 pickles it is currently producing. country b can produce, at most, 120 olives or 60 pickles, or some combination of olives and pickles such as the 100 olives and 10 pickles it is currently producing.
a. is there a basis for trade? if so, offer the two countries a deal they can't refuse.
b. how would your answer change if you knew that the per-unit cost of producing pickles and olives falls as more of each is produced? which country would you have produce which good?

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i really hope this < 3 < 3 < 3

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.