This study notes covers Worked Example 2: Multi-Buy Offer within Best Buy for GCSE Mathematics. Revise Best Buy in Ratio & Proportion for GCSE Mathematics with 12 exam-style questions and 22 flashcards. Use this page as part of a wider topic revision path rather than treating it as an isolated fact. It is section 5 of 8 in this topic. Use this study notes to connect the idea to the wider topic before moving on to questions and flashcards.
Worked Example 2: Multi-Buy Offer
Soap bars: Buy 3 get 1 free, £1.20 each OR Buy 2 for £2.00. Which is better?
Step 1 Calculate cost per bar for 3-for-2 offer
Buy 3 get 1 free: Pay for 3, get 4 bars
Cost = 3 × £1.20 = £3.60 for 4 bars
Price per bar = £3.60 ÷ 4 = £0.90
Step 2 Calculate cost per bar for 2-for-£2 offer
2 bars for £2.00
Price per bar = £2.00 ÷ 2 = £1.00
Final Compare offers
£0.90 per bar < £1.00 per bar
Buy 3 get 1 free is better value
Practice questions for Best Buy
Which method correctly compares the value of two products?
Three sizes of shampoo are available: - Travel: 100 ml for 95p - Regular: 300 ml for £2.55 - Family: 500 ml for £4.00 Find the best value size. Show all working.