The pie chart shows Lilian's expenditure last month. She spent half of what she had on food. How much did she spend on transport?

1. Determine the percentage of expenditure on Entertainment

The sector for Entertainment has a right angle ($90^\circ$).
Percentage for Entertainment = $\frac{90^\circ}{360^\circ} \times 100\% = 25\%$.

2. Determine the percentage of expenditure on Books

Total percentage is $100\%$.
Food is half, which is $50\%$.
Percentage for Books = $100\% - 50\% \text{ (Food)} - 15\% \text{ (Transport)} - 25\% \text{ (Entertainment)} = 10\%$.

3. Find the total expenditure

We know $10\%$ of the total expenditure is $\char36{}80$.
$1\%$ of the total expenditure = $\frac{\char36{}80}{10} = \char36{}8$.
Total expenditure ($100\%$) = $\char36{}8 \times 100 = \char36{}800$.

4. Calculate the expenditure on Transport

Expenditure on Transport = $15\%$ of total expenditure.
Transport = $15 \times \char36{}8 = \char36{}120$.