A Re-mix

A re-mix is what I should call my prep of "Mixtures and alligations". After all, I have already prepared this same chapter twice before.

Yes... one has to admit that the preparation is a lot easier this time due to me already having studied twice, but at the same time it is also monotonous to study the same shit year after year. This is one of the reason why I have promised myself that this is going to be my last attempt at CAT.

While preparing for this (didn't do too many questions for practice), I came across this nice question...

Mallika Milawat, the local grocer mixed three quantities of tea, T1, T2 and T3 priced at Rs.74, Rs.68 and Rs.63 per kg respectively in the ration of 1:2:4. To 4kg of this mixture she added some more quantity of T1. She now sold the mixture at Rs.84 per kg and made a killing (read Murder) of a cool 20% profit. How much of T1 did she mix with the mixture?

PS: Will update the answers later.