A 5 pound bag of potatoes costs $ 3.80$ .How much do the potatoes cost per pound?

Hint: To determine the value of cost per pound ,use the unitary method first forming a basic equation As” $ 5 $ pound bag of potatoes= $ 3.80$ ”and then dividing both sides by the number $ 5 $ to get your desired result.

Complete step-by-step answer:
In order to determine the cost of potatoes per pound,
We’ll be using a unitary method which is a technique used to define the value of a single unit.
According to question,
 $ 5 $ pound bag of potatoes= $ 3.80$
To determine cost of 1 pound bag we have to make the Left-Hand Side of the equation to 1.For this we have to divide the equation with the same value i.e. 5.But as we know that we can’t simple divide any side of the equation by any number ,we have to divide on both sides to maintain the balance otherwise it will get disturbed.
So dividing both sides of the equation by number $ = 5 $ .
Now Equation becomes
 $ \dfrac{5}{5} $ pound bag of potatoes=\[\dfrac{{\ 3.80}}{5}\]
 $ \dfrac{{{5}}}{{{5}}} $ pound bag of potatoes=\[\ $ 0.76\]
 $ 1 $ pound bag of potatoes =\[\ $ 0.76\]
Therefore, the cost of potatoes per pound bag is equal to\[\ $ 0.76\]
So, the correct answer is “\[\ $ 0.76\]”.

Note: The unitary method is a strategy for tackling an issue by first finding the estimation of a solitary unit, and afterward finding the vital incentive by increasing the single unit esteem. Generally, this method is utilized to discover the estimation of a unit from the estimation of a difference, and subsequently the estimation of a numerous.