Your sentence in #1 is correct. ) For #2, we don't use 'call' here. for a cup of coffee.
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Son JamesShe calls me for a cup of coffee at USD 15Your sentence does not make sense (unless "USD 15" is the name of a coffee shop). We use call in a sentence like this to mean call on the telephone or to mean summon.
Son Jamesa) She calls 1 cup of coffee for USD 15. – I think that this expression is wrong. You are right, "call" is not the right verb.
b) She calls me for 1 cup of coffee at USD 15.
c) She calls for USD 15 on 1 cup of coffee.If you buy offee everyday at her store