Question

Using the following prices, calculate the unit price to determine how much it would cost for 7 granola bars and 9 bottles of water.
$7.14 for 6 granola bars
$8.72 for 8 bottles of water
a.
$18.14
b.
$18.63
c.
$21.41
d.
$31.72

Answer 1

To find the total cost for 7 granola bars and 9 bottles of water, we will first calculate the unit prices for both the granola bars and the bottles of water.

**Step 1: Calculate the unit price for granola bars.**

The price for 6 granola bars is $7.14.
\[
\text{Unit Price for Granola Bars} = \frac{7.14}{6} \approx 1.19 \text{ (rounded to two decimal places)}
\]

**Step 2: Calculate the cost for 7 granola bars.**

Cost for 7 granola bars:
\[
\text{Cost for 7 Granola Bars} = 7 \times 1.19 \approx 8.33
\]

**Step 3: Calculate the unit price for bottles of water.**

The price for 8 bottles of water is $8.72.
\[
\text{Unit Price for Water Bottles} = \frac{8.72}{8} \approx 1.09 \text{ (rounded to two decimal places)}
\]

**Step 4: Calculate the cost for 9 bottles of water.**

Cost for 9 bottles of water:
\[
\text{Cost for 9 Water Bottles} = 9 \times 1.09 \approx 9.81
\]

**Step 5: Calculate the total cost.**

Total cost:
\[
\text{Total Cost} = 8.33 + 9.81 \approx 18.14
\]

Therefore, the answer is **a. $18.14**.