care or mind

[Naiverock]

Do whatever you want, I don't care.
Do whatever you want, I don't mind.

I think both sentences are all right. They can be used when the speaker's emotion varies.
In the practice, the correct answer is mind instead of care.
Could someone explain the difference between care and mind, please?
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It will sure be a lot of fun here to make friends with you guys.

[Kitosdad]

Good morning Naiverock. My thoughts are that, "I don't care," would be the closing retort in an argument.... "Do what you like, I don't care." "Go where you want, I don't care."

"I don't mind", on the other hand, would be to offer no resistance to a questioning request;
"Is it OK if I sit there?" "Is it OK to smoke in here?"
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Keep it simple ... Keep it interesting.

[Naiverock]

Thank you, Kitos, I get it.
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It will sure be a lot of fun here to make friends with you guys.

[Brprasad]

Statement:
The item is not billed and put into the bag
Quest:
Does it mean that the item hasn't been billed and it put in the bag

Thanks in advance