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Chef talks a lot on his mobile phone. As a result he exhausts his talk-value (in Rokdas) very quickly. One day at a mobile recharge shop, he noticed that his service provider gives add-on plans which can lower his calling rates (Rokdas/minute). One of the plans said "Recharge for 28 Rokdas and enjoy call rates of 0.50 Rokdas/min for one month". Chef was very pleased. His normal calling rate is 1 R

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