Question

Soda is on sale for $0.50 a can, and you have a coupon for $0.20 off your total purchase. Write a function rule

for the cost of n sodas. How much would 10 sodas cost?

Answer 1

£4.80

The function is (n×0.50)-0.20

Explanation:

(n×0.50)-0.20

(10×0.50)-0.20=£4.80

Answer 2

The price for 10 sodas is $4.80 including the coupon discount.

Explanation:

Givens

• Soda's price is $0.50 per can.
• The coupon is for $0.20 off your total purchase.

Let's represents sodas with
`n`.

Notice that the coupon number must represents a negative number here, because it's a discount, it has to decrease the price.

Additionally, the coeficient of the variable must be 0.50, because that's the price per can, that is, the constant ratio of change.

So, the expression that models this situation is

`0.50n-0.20`

So, for 10 sodas we have
`n=10`

`0.50n-0.20=0.50(10)-0.20=4.80`

Therefore, the price for 10 sodas is $4.80 including the coupon discount.