In what ratio must a grocer mix two varieties of tea worth

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In what ratio must a grocer mix two varieties of tea worth Rs. 60 a kg and Rs. 65 a kg so that by selling the mixture at Rs. 68.20 a kg he may gain 10%?

1. 4 : 5
2. 3 : 5
3. 3 : 4
4. 3 : 2

Correct Option: D

S.P. of 1 kg mixture = Rs. 68.20, Gain % = 10 %
Hence, C.P. of 1 kg mixture = (100 / 110) x 68 20 . = Rs. 62
By the rule of alligation
Hence, required ratio = 3 : 2