Candy wants to buy 3 of the same necklace. The original price for each necklace is $10. She goes to 3 different stores and they are offering her the following deals: Store A: Buy 2 necklaces at regular price and get 1 more at 1/2 price.
Store B: 30% off the regular price of each necklace.
Store C: Buy 2 necklaces and get one free.

How much MORE would 3 necklaces cost if they were purchased from Store A instead of Store B.