A donut shop would like to know whether it is cheaper to buy or make donuts. If they decide to make them, it will cost $2000 a month in fixed costs and about $0.10 for each donut. On the other hand, if they use a local bakery to supply them with donuts, the cost will be $500 a month for the contract and $0.25 per donut. Determine how many donuts should be sold a month to consider making them. Select one: a. 1000 b. 1500 c. 2500 d. 5000 e. 10,000