Please show your work and explain each step.

7&8 O'Neill, Incorporated's segmented income statement for the most recent month is given below. For each of the following questions, refer back to the above original data. 7. If Store B sales increase by $20,000 with no change in fixed expenses, the overall company net operating income should: A. increase by $2,500 B. increase by $5,000 C. increase by $8,000 D. increase by $12,000 8. The marketing department believes that a promotional campaign at Store A costing $6,000 will increase sales by $15,000. If its plan is adopted, overall company net operating income should: A. decrease by $1,800 B. decrease by $10,200 C. increase by $10,200 D. increase by $1,800