The nurse would teach the client to implement which of the following nasal care measures after the nasal packing is removed

A. Irrigate the nares with normal saline solution daily.
B. Remove old blood from inside the nares with cotton-tipped applicators.
C. Avoid cleaning the nares for at least 2 days.
D. For comfort lubricate the membranes with a water-soluble lubricant.

已知某企业生产A、产品，计划年度产量10000台，固定成本25万元，变动成本35万元。通过调查发现市场可接受价格115元/台，零售商与批发商期望毛利率分别为25%和15%。

计算产品边际贡献。