1.E=20 pagesS=50 pagesIf Maria spends 5hours on reading Economicsshe would read(20∗5)pages=100pagesIf she spends 5hours on Sociology,she would read(50∗5)pages=250pagesif she decides to spend 2.5hours each on them,she would read;(20∗2.5)pages=50pages of Economics(50∗2.5)pages=125pages of Sociology

2.To read 1 page of Sociology, she is giving up,20pages50pages=2.5 pages of EconomicsTherefore, to read 100 pages of Economics,Maria would have to give up(100∗2.5)=250pages of Economicswhich is her opportunity cost.
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