The Circle Clock Company sells a particular clock for $25. The variable costs are $13 per clock

Question:

The Circle Clock Company sells a particular clock for $25. The variable costs are $13 per clock and the breakeven point is 250 clocks. The company expects to sell 300 clocks this year. If the company actually sells 400 clocks, what effect would the sale of additional 100 clocks have on operating income? Explain your answer.