https://file.aiquickdraw.com/mathbot/file/1729024437151138sjsha.jpg

The cost formula provided in the image is:

\[
\text{Cost} = £12.50 \times \text{number of children} + £18
\]

For a party of 4 children, we can substitute 4 into the formula:

\[
\text{Cost} = £12.50 \times 4 + £18
\]

Now, let's calculate the cost step by step:

1. Multiply £12.50 by 4:
   \[
   £12.50 \times 4 = £50
   \]

2. Add £18 to this amount:
   \[
   £50 + £18 = £68
   \]

So, the total cost of hiring the bus for a party of 4 children is **£68**.

Would you like more details or have any questions?

Here are some related questions:
1. How much would it cost to hire the bus for 6 children?
2. What is the cost per child for a party of 4 children?
3. How does the £18 fixed fee affect the overall cost?
4. What would the cost be if no children attended the party?
5. If the cost per child increased to £15, what would the new total cost for 4 children be?

**Tip**: Always separate fixed costs (like the £18 here) from variable costs (based on the number of children) for easier calculations.

What is the cost of hiring a bus for a party of 4 children?

Learn how to calculate the cost of hiring a bus for a party of 4 children using a simple arithmetic formula. The cost per child is £12.50, with an additional fixed fee of £18. This problem helps students practice multiplication and addition, suitable for Grades 4-6.

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