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The problem states that the cost of buying 7 hats is £108.50, and you are asked to find the cost of buying 10 hats.

### Step 1: Find the cost per hat.
The cost for 7 hats is £108.50, so the cost for one hat is:
\[
\text{Cost per hat} = \frac{108.50}{7} = 15.50
\]

### Step 2: Calculate the cost of 10 hats.
Now that we know each hat costs £15.50, the total cost for 10 hats is:
\[
\text{Cost for 10 hats} = 15.50 \times 10 = 155.00
\]

### Final Answer:
The cost to buy 10 hats is **£155.00**.

Would you like further details or have any questions?

Here are 5 related questions to explore:
1. How would the answer change if the cost for 7 hats were £120 instead?
2. What is the formula to calculate the cost for *n* hats if given the cost for *m* hats?
3. How do you calculate the percentage increase if the price per hat goes from £15.50 to £18?
4. If a 10% discount is applied to the total cost of 10 hats, how much would you save?
5. What would be the cost of 50 hats at the same rate per hat?

**Tip:** When solving word problems, always break down the question into smaller steps, like calculating unit rates or costs per item.

It costs £108.50 to buy 7 hats. How much does it cost to buy 10 hats? Give your answer in pounds (£).

Learn how to calculate the total cost of buying 10 hats when given the cost for 7 hats (£108.50). This problem uses concepts such as unit rate and proportional reasoning. Suitable for students in Grades 5-7.

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