An error was made by marrow company in computing the percentage-of-completion of the current year's ending work-in-process inventory. the error resulted in the assignment of a lower percentage of completion to each component of the inventory than actually was the case. there was no beginning work-in-process inventory. what is the effect of this error on (1) cost assigned to cost of goods completed for the period (2) the computation of costs per equivalent unit? a) understated; understated b) understated; overstated c) overstated; understated d) overstated; overstated