How would I determine number 11?

11. Situation 21-1 Diane's Donuts will begin selling donuts next week. Diane figures that the average variable cost to make each donut will be constant at $0.30. She has already paid $20,000 for the donut-making machinery and one year's rent. Refer to Situation 21-1. What will Diane's average total costs be if she sells 2,500 donuts in her first week and then goes out of business? $8.30 $1.81 $1.08 $9.71