Elaine values the utility of her first cup of coffee at $1; a second cup, $.75; and a third cup, $.50 . If Elaine drinks three cups of coffee for breakfast, her total utility is equal to
a. $.50, the value of her last cup of coffee.
b. $1.00, the value of her first cup of coffee.
c. marginal utility.
d. $2.25.
e. $1.50.
d
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