During school days, Yagami sells notebooks to college students. Last school year, he sold the notebooks for 40 pesos each and his sales averaged 30 per day. When he increased the price by 4 pesos, he found that the average decreased by two sales per day.  a) Find the price-demand function , assuming that it is linear. What is the domain of ?  b) If the materials for making each notebook cost Yagami 16 pesos, what should the selling price be to maximize profit?

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Differential Equations

Have you ever observed the movement of the satellites and rockets or how the planets go around the sun in their orbits? How will you determine their motion? Definitely they follow some scientific laws and these kinds of problems are framed as differential equations.