Presence of Memory - Answer it

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in this era,everyone needs a important skill called presence of mind.just answer this question:a man asked 1/2 kg of butter.but salesboy replied that ther is 1kg of butter.but man insisted on only 1/2 kg of butter.salesboy went inside manager room and said "an idiot is standing outside asking for 1/2 kg of butter",shockingly man stands right to him.now how does the boy react {his answer must satisfy both the manager and man}

can anyone tell the answer
MUKIL, proud to be a member of Vidyarthiplus.com (V+) - Online Students Community since Mar 2013.
he said that the idiot is standing outside, but the man seeking butter is behind him, so he not mentioned the customer,.. is this correct...
vishnuprakash, proud to be a member of Vidyarthiplus.com (V+) - Online Students Community since Apr 2013.
no bro ,the answer is ,after seeing the man,the salesman said " an geneius is also standing outside asking for 1/2 kg of butter"
MUKIL, proud to be a member of Vidyarthiplus.com (V+) - Online Students Community since Mar 2013.

    Presence of Memory - Answer it