Meena gets ₹500 pocket money a month and spends ₹100 of it on books. The pie chart of her spending is drawn with true angles. Which lettered sector stands for books?

A pie chart shows how a whole splits into parts. Each category gets a slice (sector) of the circle, with angle proportional to the category's share.

**Sector angle = $\frac{categoryfrequency}{totalfrequency}\times 360°$.**

Example: 60 students, 20 like cricket. Cricket sector = $\frac{20}{60}\times 360=120°$.

All sector angles must add to 360° (full circle). Always check this as a sanity step.