Office Work Company orders two hundred staplers from Office Supply Store at the price of $3 per stapler. Office Supply Store accepts the offer by promising prompt shipment. Office Supply does not make a prompt shipment, and no staplers from another supply company. What are Office Work Company's damages under the UCC, assuming it paid (a) $3.20 for the replacement staplers, (b) $3.50 plus $.10 in shipping expense for the replacement staplers, and (c) $2.80 for the replacement staplers?

I read through my chapter and this has me puzzled. Can anyone help me with this one?