Apples are on sale for $3.12 per kilogram. Is the total cost of the apples proportional to the total mass?

Yes.

Step-by-step explanation:

We have given the price of apple per kilogram.

Hence, price of total apples is equal to the product of number of apples and price per kilogram of apple.

Answer: Yes

Tc = 3.12m

Therefore, total cost of apple is directly proportional to the total mass with a proportionality constant of 3.12.

Step-by-step explanation:

The total cost of the apples is proportional to the total mass. The product of the mass and the cost per mass ($3.12) gives the total cost.

It can be shown using the equation below

Tc = c*m

Where Tc = total cost

c = cost per unit mass

m = total mass in kilogram

Tc = 3.12m

Therefore, total cost of apple is directly proportional to the total mass with a proportionality constant of 3.12.