Sally wants to purchase a new sofa because she purchased a new home at the beach.Sally visited two stores and she narrowed down her choices to a red sofa and a blue sofa.Sally owns pets so she considers the cost of insurance to insure each sofa.Sally compiled the following data and she realizes that the sales tax to purchase the sofa is 10% in her state. 
Which sofa should Sally purchase? What costs are relevant in her decision? Why?
Definitions:
Concrete Operations
A stage in Piaget's theory of cognitive development where children aged 7-11 start thinking logically about concrete events but still struggle with abstract concepts.
Formal Operations
A stage in Piaget's theory of cognitive development (beginning around age 12) where individuals develop the ability to think about abstract concepts and logically test hypotheses.
Deferred Imitation
A cognitive ability where an individual can replicate an action or behavior after a delay or pause, indicating memory and understanding.
Symbolic-Function
Symbolic function is a cognitive development concept whereby children acquire the ability to mentally represent and think about objects and events that are not physically present through symbols or language.
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