The way he could ration his time in order to do the things which he wants to do would be to forego an alternative which would be his opportunity cost.
This refers to the foregone alternatives when making a decision.
Hence, he could see the movie without losing the discounted price if he rejected the $100 offer and went with his friends.
No, he could not meet all his obligations because he would have to forego at least one.
The most effective use of time for him would be to go to the cinema, watch the early show, go watch football with his uncle, and reject the neighbor's offer.
The best alternative for this time dilemma would be to forego an alternative.
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