Question

A store sells 3 ears of corn for $1 they round prices to the nearest cent.Tell whether you would describe the relationship between cost and number of ears of corn as proportional relationship. justify your answer.

Table:
Ears of corn: 1 2 3 4
Amount charged: 0.33 0.67 1.00 1.34

Answer 1

As the price of corn raises the amount charged increases by .34

In other words a linear equation can be used.
y=.33x where x is the amount of corn and y is the the total cost in dollars.

Answer 2

A store sells 3 ears of corn for $1 they round prices to the nearest cent.

Ears of corn: 1 2 3 4

Amount charged: 0.33 0.67 1.00 1.34

1 ear of corn for $0.33

2 ears of corn for =
`0.33*2=0.66` rounded to $0.67.

3 ears of corn for =
`0.33*3=0.99` rounded to $1.

The answer will be:

Yes; the relationship between cost and number of ears of corn is proportional.

Even though the rates in the table are not constant per ear of corn, but there is a constant rate for every 3 ears of corn.