The number of stores will be 3 and the opportunity cost of building 3 more stores will be 6 apartment buildings.
<h3>How to explain the opportunity cost?</h3>The Vertical Line represents the number of Stores. The horizontal line represents the number of Apartments.
Take a look at point E. When the apartment is 9, the stores that they could build is 3.
In point C, the company produces 6 Apartments and 7 Stores. If the company wants to build 3 more stores it would become 10 stores. Take a look at point A. Where the stores are 10, the company cannot build any apartments, which means that they had to sacrifice all 6 from point C.
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