Answer: The required cost in dollars per kg of tomatoes is $10 per kg.
Step-by-step explanation: Given that Amy bought 0.4 kg of tomatoes for $4.00.
We are to find the cost in dollars per kg of tomatoes.
We will be using the UNITARY method to solve the given problem.
The cost of 0.4 kg of tomatoes = $4.00.
Therefore, the cost of 1 kg of tomatoes is given by
[tex]\$\dfrac{4.00}{0.4}=\$\dfrac{40}{4}=\$10.[/tex]
Thus, the required cost in dollars per kg of tomatoes is $10 per kg.
