Firms A, B, and C operate in the market for computers. Each firm's product is popular in the market and is distinct from what the other firms offer. The following table shows the prices of laptops from 2005 through 2007. 
Which of the following is the unweighted price index for the total price of three types of laptops in 2006, using 2005 as the base year?
Definitions:
Elongation
Elongation in biology refers to the lengthening of structures or molecules, such as the growth of plant roots or the process during protein synthesis where the polypeptide chain is extended.
Termination
In genetics, termination refers to the end of the process of transcription or translation, finishing the synthesis of the RNA or protein molecule.
Translation
The process by which the sequence of bases in mRNA is converted into an amino acid sequence in proteins.
Initiation
The first phase in various biological processes, such as DNA replication, transcription, and translation, where the necessary components are assembled to begin the process.
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