1What does per cent actually mean, and why is it so useful?
2Why does a 20% rise followed by a 20% fall not bring a price back to where it started?
3A shirt costs Rs 720 after a 20% discount. Why is the original price not Rs 864?
4Why can percentages of different groups not simply be averaged?
5How would you find 15% of Rs 800 without a calculator, and why does that method work?