A shopkeeper purchased 40 kg salt at Rs 15 per kg and mixed it with 80 kg salt at Rs 20 per kg...........

Quantitative Aptitude (CDS) Profit and loss

A shopkeeper purchased 40 kg salt at Rs. 15 per kg and mixed it with 80 kg salt at Rs. 20 per kg. At what rate should he sell the mixture to gain 12%?

Rs. 22.9

Rs. 21.5

Rs. 20.9

Rs. 20

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Explanation:

CP of 120 kg of mixture = Rs. (40 x 15 + 80 × 20) = Rs. 2200
SP of 112% of Rs. 2200 = Rs. (114/100 ×2200) = Rs. 2508
Rate of SP of the mixture = Rs. (2508/120) per kg = Rs. 20.9
At Rs. 20.9 he should sell the mixture to gain 12%