H has in inventory 15,000 kg of M, a raw material which it bought for $3/kg five years ago, for a product line which was discontinued four years ago. M has no use in its existing state but could be sold as scrap for $1.00 per kg. One of the company’s current products (HN) requires 4 kg of a raw material, available for $5.00 per kg. M can be modified at a cost of $0.75 per kg so that it may be used as a substitute for this material. However, after modification, 5 kg of M is required for every unit of HN to be produced.
H has now received an invitation to tender for a product which could use M in its present state.
What is the relevant cost per kg of M to be included in the cost estimate for the tender?