An error was made by roc 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 and (2) the computation of costs per equivalent unit? 1 2 a. understated understatedb. understated overstatedc. overstated understatedd. overstated overstated