Exercises

1. Add an ‘info’ instance method to your Song class that returns a string that contains information about the song in an easy to read format.
2. Create a new class called Product, that will produce products that are available for sale.
   • Write a constructor such that each product will have a name, a description, and a price.
   • Write methods that retrieve each of these attributes.
   • Write methods that allow us to redefine those attributes.
   
   Once you write the class, you should be able to run this code:

   product = Product.new("Printer", "It prints pages!", 94)
   p product
   p product.name
   product.name = "Awesome Printer"
   p product.name

   The code should output:

   #<Product:0x007fb18987bf30 @name="Printer", @description="It prints pages!", @price=94>
   "Printer"
   "Awesome Printer"

3. Now on the Product class, add the following features.
   • Add a method called tax that returns the price multiplied by 0.09 (which will represent sales tax.) This tax method should call the price method.
   • Add a method called total which returns the sum of the price plus the tax. This method should reference both the price method as well as the tax method.

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