5. Let the supply and demand functions for yogurt ice cream be given by S(x) = 0.4x and D(x) = 100 0.4x, respectively. What is the equilibrium quantity and price?

6-8. The financial research department of a company that manufactures earphones determine its cost function as C(x) = 120x + 3900. The company sells the earphone at Php250 each.

6.How many earphones must be sold to realize a profit of Php150,020?

7.What is the profit from the sale of 250 units?

8.What is the break-even quantity?

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9-10 A baker sells her cakes at Php 285 per piece selling all that she produces. Her fixed cost is Php 4,500 and her variable cost is Php 92 per piece.

9. With how many cakes will she break even?

10. With how many cakes will she enjoy a profit of Php 5,000? A loss of Php 1,000?