Three shops sell shirts. At which shop is it cheapest to buy 6 shirts? Show working to support your answer.
Shop A: Pack of 2, £19.00
Shop B: Was £12.40, Now 25% off (price per shirt)
Shop C: Pack of 3, £37.40. Buy one pack, get another pack half price.

This is a "best buy" problem. We need to calculate the cost of buying 6 shirts from each of the three shops and then compare them. **Shop A:** The shirts are sold in packs of 2. To get 6 shirts, you need 6 ÷ 2 = 3 packs. Total cost = 3 × £19.00 = £57.00. **Shop B:** The shirts are sold individually. The price is £12.40 with a 25% discount. A 25% discount means you pay 100% - 25% = 75% of the original price. Price per shirt = 0.75 × £12.40 = £9.30. Total cost for 6 shirts = 6 × £9.30 = £55.80. **Shop C:** The shirts are sold in packs of 3. To get 6 shirts, you need 6 ÷ 3 = 2 packs. The offer is "buy one pack, get another pack half price". Cost of the first pack = £37.40. Cost of the second pack = £37.40 ÷ 2 = £18.70. Total cost = £37.40 + £18.70 = £56.10. **Comparison:** - Shop A: £57.00 - Shop B: £55.80 - Shop C: £56.10 The lowest cost is £55.80, which is at Shop B.