Accounting XYZ ltd is a manufacturing concern, currently using a machinery which has a semi variable cost of 200,000$. Currently it is operating at 50% capacity, producing 5000 units. If it increases its production, its cost will increase by 10% up to 70%, after that it will increase by 20% up to 90% and if it realises its full capacity, its cost will shoot up by 40%. Prepare a table for calculation and figure out the optimal level of production.