Three comparable brands of 1 litre cans of a liquid detergent are available in a shop with different offers as shown in the table.
| Brand | List price (in Rs per can) | Offer |
| A | 320 | 1/3rd extra |
| B | 332 | 1 free for 3 |
| C | 300 | 20% discount |
If 4 litres of detergent is to be purchased, then the best choice (based on unit price) would be
1
A or B
2
A or C
3
B or C
4
B