Sir pls explain this. Taking a special order from a customer. Mat x : Total quantity required : 500kg , currently in inventory : 300kg , carrying value : $5 per kg, realisable value : $3 per kg, replecement cost : $7 per kg..it says mat x are no longer in regular use.There is no alternative use for mat x. calculate relevant cost for mat x.. They solved it this way, 500.3=1500$ .. I failed to get it..pls help.