Good day, Educators. This is a 1 - 5 question. Hope you can help me. ?

20. Suppose that for the past * 2 puntos two months, you have studied economics one hour a day. You now decide to study economics two hours a day. For the past two months, A) your marginal cost of studying 0 economics for an hour must have exceeded its marginal benefit 0 B) the opportunity cost of studying economics must have risen. O C) the marginal cost of studying economics must have fallen D) your marginal benefit from studying 0 economics an hour must have been greater than its marginal cost 21.lf the cost of a computer falls * 2 puntos by a large amount, you have an incentive to O A) use your friend's computer rather than buy one yourself B) avoid buying anew computer because it is now less valuable 0) take a shorter vacation 000 D) buy a new computer 22. Factors of production include * 2 puntos all of the following EXCEPT O A) machines made in past years 0 B) money 0 C) an wheat field that is not irrigated O D) entrepreneurship 23. Which of the following is an * 2 puntos implicit cost to a business? A. The costs that are associated with 0 factors of production that can be varied in the short-rum O B. The forgone opportunity for the business to engage in the current activity 0 C. Any and all costs to the firm that are termed accounting costs 0 D. None of the above 24. Economics can be defined as * 2 puntos the social science that explains the A) choices that we make as we cope with scarcity B) choices made by households C) choices made by politicians D) choices we make when we trade in markets OOOO 25. When a university decides to * 2 puntos add to the football stadium instead of adding to the baseball stadium, it faces the ( A) "what" tradeoff. O B) "how" tradeoff. ( c) macroeconomic question ( D) "for whom" tradeoff