Question 15 (2 points) Saved ) Listen Prairie Glass has a current production level of 200,000 glass jars per month. Unit costs at this level are: Direct materials $0.345 Direct labour 0.400 Variable overhead 0.175 Fixed overhead 0.100 Marketing - Fixed 0.100 Marketing/distribution - Variable 0.200 Current monthly sales are 180,000 units. Southern Hardware Ltd. has contacted Prairie Glass about purchasing 15,000 units at $1.00 each. Current sales would not be affected by the special order, and variable marketing/distributing costs would not be incurred on the special order. What is Prairie Glass's change in operating income if the order is accepted? O $1200 increase $300 increase $4800 decrease $1800 decrease