The atg.commerce.pricing.ConfigurableItemPriceCalculator class extends the ItemPriceCalculator. It calculates the list price of a configurable item and sets the itemPriceInfo to that amount. It computes the price of the configurable item by adding up the price of all the individual subSKUs and the price of the configurable SKU. This sets the list price with the prices of the subSKUs that are configured in the configurable item. If the configurable item is on sale then the sale price will also be modified.