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11. In what ratio must tea worth Rs. 60 per kg be mixed with tea worth Rs. 65 a kg such that by selling the mixture at Rs. 68.20 a kg ,there can be a gain 10%? | |

A. 2 : 3 | B. 3 : 4 |

C. 3 : 2 | D. 4 : 3 |

Answer: Option C

Explanation:

Cost Price(CP) of 1 kg mixture = Rs. 68.20

Profit = 10%

Cost Price(CP) of 1 kg mixture $=\dfrac{100}{(100+\text{Profit}\%)}× \text{SP}$

$=\dfrac{100}{(100+10)}× 68.20\\\\= \dfrac{100}{110}× 68.20=\dfrac{682}{11}= \text{Rs. }62$

By rule of alligation

CP of 1 kg tea of 1st kind | CP of 1 kg tea of 2nd kind | |||||||||

60 | 65 | |||||||||

Mean Price | ||||||||||

62 | ||||||||||

65 - 62 = 3 | 62 - 60 = 2 |

Hence required ratio = 3 : 2

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