A musical instrument manufacturing company is considering a new project that will require 1000 kg of wood. They have 700 kgs of wood in stock which was purchased last year for £4 per kg. The wood in stock can be

sold back to the supplier for £5 per kg. The wood in stock will have to be replaced if it is used. The current purchase price of wood is £8 per kg.

Using this information, what is the relevant cost of wood for the manufacturers decision on this project?