The correct answer is ₹160:
Step 1: Given Information
Amal bought 110 kg of syrup and 120 kg of juice. The cost price of syrup was 20% less than the cost price of juice.
Step 2: Cost Price of Syrup and Juice
Let the cost price of 1 kg of juice be $10\,\text{CP}$. Consequently, the cost price of 1 kg of syrup is $8\,\text{CP}$ (20% less than juice).
Step 3: Selling of Syrup and Juice
Amal sold 10 kg of syrup at a 10% profit, resulting in a selling price of $1.1 \times 8\,\text{CP} = 8.8\,\text{CP}$. Amal sold 20 kg of juice at a 20% profit, with a selling price of $1.2 \times 10\,\text{CP} = 12\,\text{CP}$.
Step 4: Selling the Mixture
Amal combined the remaining syrup and juice and sold the mixture at ₹308.32 per kg. The total selling price of the mixture was $308.32 \times (110 + 120) = 308.32 \times 230 = 70,912$.
Step 5: Calculating Total Cost and Profit
The total cost price is the sum of the cost of syrup and juice: $110 \times 8\,\text{CP} + 120 \times 10\,\text{CP} = 880\,\text{CP} + 1200\,\text{CP} = 2080\,\text{CP}$. The overall profit was 64%, making the total selling price $1.64 \times 2080\,\text{CP} = 3411.2\,\text{CP}$. The amount already received from selling 10 kg of syrup and 20 kg of juice was $10 \times 8.8 + 20 \times 12 = 88 + 240 = 328$. Therefore, the mixture was sold for $3411.2 - 328 = 3083.2$. The amount of mixture was $230 - 10 - 20 = 200$ kg, resulting in a price per kg of $\frac{3083.2}{200} = 15.416$, which corresponds to ₹308.32 when scaling CP to Rupees.
Step 6: Finding the Cost Price of 1 CP
By equating ₹308.32 with $15.416\,\text{CP}$, we find that ₹1 = $\frac{308.32}{15.416} = 20$. Thus, 1 CP = ₹20.
Step 7: Cost Price of Syrup
The cost price of syrup per kg is $8 \times ₹20 = ₹160$.
Final Answer: ₹160 per kg
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