The conversation between human and AI assistant.
[|Human|] Calculate the total cost for purchasing 3 items of given price.
[|AI|] The total cost of purchasing all three items would be the sum of the prices of each item, which would be $10.99 + $6.45 + $8.99 = $26.43.
[|Human|] 
Calculate the total cost for purchasing 3 items of given price.