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Milawati Sharma, the local grocer mixed three qualities of tea T1, T2 and T3 priced at Rs 74 per kg, Rs 68 per kg and Rs 63 per kg in the ratio of 1:2:4. He added some more quantity of T1 to 4 kg of this mixture. He sold this new mixture for Rs 84 per kg, thereby making a profit of 20%. How much of T1 did he mix with the mixture?