Easty’s Co Ltd makes its own spare parts for its major product ‘The Flying East’. Annual demand for one spare part is 2,500 units per year. The cost per unit is £12 and stock holding costs amount to 2.5% per year of the stock value. It costs £120 per batch to deliver from the spares manufacturing division to the main production site.

Required Calculate the economic batch quantity for this spare part. Present your solution in both graphical and tabular terms.