Sardar with his wife goes to a coffee..

Sardar with his wife goes to a coffee restaurant! He orders 2 nescafes. When the order comes he drinks his nescafe in one gulp and urges his wife to drink it quickly. His wife asks why? Saradar ji points his wife towards the sign which says                                                                                                                                       HOT NESCAFE – 5 RUPEES
COLD NESCAFE – 10 RUPEES