You are given the following figures as of December 31, 2021: Installment contracts receivable - 2021:     285, 000 Purchases                                                    284, 000 Shipments on installment basis                  240, 000 Trade-ins                                                     13, 000 Repossession                                                7, 000 Installment sales                                         398, 000 Other sales                                                  50, 000 Loss on default                                             3, 000 Operating expense                                      35, 000   Other sales include those of second-hand items acquired as repossessions and trade-ins of P1, 500 and P4, 000 respectively. The merchandise inventory (new) as of December 31, 2021 was P18, 000. The bookkeeper failed to record a trade-in of P2, 000 and the item was still unsold as of the end of the year. The ending inventory of second-hand items must be?