1/ Debra is thinking about going to Disneyland with her friend.Debra is willing to pay HK$X to go to Disneyland.A ticket to Disneyland costs HK$409 and she will have to cancel her part-time job that pays HK$428.Normally, she would be unwilling to do the part-time job for less than HK$212.(Debra views the unpleasantness of the part-time job as an offset against hersalary.)Debra will decide to go to Disneyland if and only if X is larger than or equal to[Answer]dollars.

(In decimal numbers, with two decimal places, please.)

2/ Benny is thinking about going to the gym class and his benefit from going to the gym class is $470.The gym class costs $265 and he will have to cancel his part-time job as a cleaner that pays $316. Normally, he would be unwilling to do the part-time job for less than $Y.(Benny views the unpleasantness of the part-time job as an offset against its salary.)Benny will decide to go to the gym class if and only if Y is at least[Answer].

(In decimal numbers, with two decimal places, please.)

3/Ben enjoys doing volunteer work very much.During weekends, he often goes to the community center next to his home.He treasures the time doing volunteer work and considers it worth $304.He does not need to spend any money on transportation as he can walk to the community center and no other cost will incur if he does the volunteer work.If he does not go to the community center, he can use the same amount of time working as a private tutor and earning $491.The job as a private tutor is unpleasant to him.He is not willing to do the tutoring job unless he is paid at least $X.If Ben finally decided to go to the community center, the value of X must be larger than or equal to[Answer].

(In decimal numbers, with two decimal places, please.)

4/Darren bought a ticket to a football game at $502 and Joe bought a ticket to a concert at $690.Both events will be held at the same time and the tickets are nonrefundable.Joe finds the football game to be interesting and offers to directly swap tickets with Darren.Suppose that Darren values the game at $632 and the concert at $885.Darren's opportunity cost of rejecting Joe's offer and going to the football game is[Answer]dollars.

(In decimal numbers, with two decimal places, please.)

5/Blake is deciding whether to go swimming or study after class.He goes swimming frequently and has bought a non-refundable swimming pool annual ticket costing $286.If he spent the time studying after class, he would be able to enrich his knowledge and be confident in any assessments, which would bring him pleasantness worth $326.If Blake decides to go swimming rather than studying, his opportunity cost of going to swim is[Answer]dollars.

(In decimal numbers, with two decimal places, please.)

6/Catherine would like to attend a three-hour skiing lesson which she has to pay a tuition fee of $231.Her benefit from the skiing lesson is $500.If she does not attend the lesson, she can teach three hours of cooking class with an hourly wage of W dollarsper hour.Or play with her adorable puppy, for three hours with a total of $104 of enjoyment. Assume there are no extra costs for the above events.Catherine should attend the skiing lesson if W is at most[Answer].

(In decimal numbers, with two decimal places, please.)

7/Theo is considering going to his friend's birthday party for 2 hours and his enjoyment from the party is $879.To attend the party, he has to buy a present that costs $W and he will have to cancel his 2-hour private tutoring job that pays HK$468per hour.Normally, he would be unwilling to do the private tutoring job for less than HK$231per hour.(Theo views the unpleasantness of the tutoring job as an offset against its salary.)Theo will decide to go to his friend's birthday party if and only if W is at most[Answer].

(In decimal numbers, with two decimal places, please.)

8/You are considering to take a 2 days staycation to Lantau Island during the weekend.You have already bought a round trip ferry ticket at $106, which is fully refundable.To go to Lantau Island, you will have to apply for a leave from the part-time job where you normally work 10-hours a day at $14 per hour.You will live in your friend's place so you don't have to spend anything on accommodation.You currently live in a hotel with a daily rent of $312 that is non-refundable and typically pay $94 per day for food.You estimated that you need to pay a total of $294 for food during the staycation.Assuming there are no other costs, the total opportunity cost of the staycation for you is[Answer]dollars.

(In decimal numbers, with two decimal places, please.)