A boy went to a shop and handing a ten-rupee note to the salesgirl asked for a chocolate bar.
"CHIC or CHOC?" she asked. The boy asked for CHOC.
CHIC and CHOC are two brands of chocolate bars. CHIC costs Rs. 9 and CHOC, Rs.10.
A little later another boy came to the shop and placing ten rupees on the counter asked for a bar of chocolate. The salesgirl gave him a bar of CHOC.
Why didn't she ask him which brand he wanted?