2. My recipe for apple crumble uses $100 \mathrm{~g}$ of flour, $50 \mathrm{~g}$ of butter and $50 \mathrm{~g}$ of sugar to make the crumble topping. When my family come for a meal, I have to use two and a half times each amount to provide enough crumble. In total, how much crumble topping do I then make?
A $0.5 \mathrm{~kg}$
B $2 \mathrm{~kg}$
C $2.5 \mathrm{~kg}$
D $5 \mathrm{~kg}$
E $50 \mathrm{~kg}$
2. A The amount of topping required is $2 \frac{1}{2} \times(100+50+50) \mathrm{g}=2 \frac{1}{2} \times 200 \mathrm{~g}=500 \mathrm{~g}=0.5 \mathrm{~kg}$.