How many kg of salt costing Rs 28 per kg must...

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How many kg of salt costing Rs. 28 per kg must be mixed with 39.6 kg of salt costing Rs. 16 per kg, so that selling the mixture at Rs. 29.90, there is a gain of 15%.

A. 198

B. 135

C. 132

D. 131

Answer: Option D

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