饼图显示了娜塔莉（Natalie）上个月的开销。她在食物上花了多少钱？ 答：$ ___

1. Determine the percentage of expenditure on Transport

The right-angle symbol indicates a quarter of the pie chart.
$\text{Transport} = \frac{1}{4} = 25\%$

2. Determine the percentage of expenditure on Food

$\text{Food} = \frac{1}{2} = 50\%$

3. Calculate the percentage of expenditure on Books

$\text{Books} = 100\% - 50\% - 15\% - 25\% = 10\%$

4. Find the total expenditure or the expenditure on Food directly using proportions

Since $10\%$ represents $\char36{}40$,
$1\%$ represents $\char36{}40 \div 10 = \char36{}4$.
Food is $50\%$, so Food expenditure $= 50 \times \char36{}4 = \char36{}200$.