What does 'at no charge' mean?

[Sushi?]

English Idioms and Expressions, Elementary Level

ESL/EFL Test #4 "For Good", question 5

As you're a friend of mine, I won't charge you much in fact I'll do it for nothing.

(a) at some charge
(b) at little charge
(c) at low charge
(d) at no charge

English Idioms and Expressions, Elementary Level

ESL/EFL Test #4 "For Good", answer 5

As you're a friend of mine, I won't charge you much in fact I'll do it at no charge.

Correct answer: (d) at no charge
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?at no charge

[Alan]

Hi,

If somebody does something for you for no charge, it means it doesn't cost you anything.

Alan
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English as a Second Language
You can read my ESL story In Order

[Ctnsite]

Does "at no charge" have the same meaning with "at no cost" here?

[Torsten]

Yes.
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Test Of English for International Communication
TOEIC Preparation & TOEIC Vocabulary