- ANo — the pack of 5 is cheaper per notebook
- BYes — the prices are in proportion
- CNo — the pack of 3 is cheaper per notebook
- DYes — each notebook costs ₹25 in both
Step-by-Step Solution
Unitary method: pack of 3 each; pack of 5 each. The unit prices differ, so not in proportion, and the pack of 5 is cheaper.
Answer: A) No — the pack of 5 is cheaper per notebook