A merchant mixes three varieties of rice and sells the mixture at the rate of $31.20 per kg thereby making a profit of 30%. If the first variety costs $20, the second variety costs $26 and the third variety costs $30 per kg respectively, how many kgs of the second variety should he take to obtain the mixture if he took 22kgs of the first variety of rice?
None of the above
Pls include reasoning along with all answer posts.
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