Every evening for dinner phil a. ofish has one serving of fish and two servings of mashed potatoes. the marginal utility of the last serving of fish is 200 utils and the price of fish is $5 per serving. if we assume that phil is a utility-maximizer, what can we say about the marginal utility of the last serving of mashed potatoes if the price of each serving of mashed potatoes is $2

Simon, aged 10, is invited to a classmate's birthday party at an exclusive ski resort on march 15th. the day will include 4 hours of snowboarding, lunch and birthday cake. simon's mother checks a box on the invitation that says "yes, we will attend" and returns it to the classmate's address. unfortunately, they later don't attend the party when simon comes down with the flu. on march 17th, simon's mother receives an invoice in the mail from simon's classmate for $35 that says, "party no-show fee." can simon's classmate collect the fee?