If a company categorises its inventory into three classifications according to their usage value, calculate the usage values of the following items and classify them along Pareto lines into A, B and C items.

Item no. Annual quantity used Unit value 1 75 £80.00 2 150,000 £0.90 3 500 £3.00 4 18,000 £0.20 5 3,000 £0.30 6 20,000 £0.10 7 10,000 £0.04