Final answer:
To find the cost per kg of the mixture, add the costs of the soybean oil and canola oil and divide by the total weight of the mixture.
Step-by-step explanation:
To find the cost per kg of the mixture, we need to calculate the total cost of the soybean oil and canola oil and divide it by the total weight of the mixture.
The cost of 7 kg of soybean oil is 7 * $4 = $28.
The cost of 14 kg of canola oil is 14 * $1 = $14.
The total cost of the mixture is $28 + $14 = $42.
The total weight of the mixture is 7 kg + 14 kg = 21 kg.
Therefore, the cost per kg of the mixture is $42 / 21 kg = $2 per kg.