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Answer and Explanation:The computation is shown below:It is given that Ramon would completed an essay question in approx 15 minutes and for graphing question it finished approx 30 minutesOn the other hand Sammy would completed an essay question in approx 20 minutes and for graphing question it finished approx 35 minutesa) Ramon's opportunity cost of completing an essay question is= 15 ÷30= 0.5 graphing questionb) Ramon's opportunity cost of completing a graphing question is= 30 ÷ 15= 2 essay questionc) Sammy's opportunity cost of completing an essay question is= 20 ÷ 35= 0.57 graphing questiond) Sammy's opportunity cost of completing a graphing question is= 35 ÷ 20= 1.75 essay question...