Suppose on december 31, hipzone inc. Bills one of their customers $450 for a project that they had completed which had accumulated $220 of costs. The invoice has the normal terms requesting payment in 30 days. Make all of the entries required by this transaction. Hint: think of accumulated project costs as an account similar to inventory - it is an asset account used to accumulate the costs that have been incurred related to the project being completed for the customer.