Do you mean countertop? If it's the countertop, you may have to replace it. Price depends on the size of the countertop. Measure the size and then go to homedepot or any kitchen hardware place to get an estimate, then you will know if it's worthwile to have it fixxed or just pay the security deposit.
Don't do anything. We also put a boiling hot pot on the countertop by mistake and left an ugly ring. The rental company just ignored it and didn't charge us for any damage. I guess it all depends on your rental company, mine was Homestead.