IMC 2005 Q6
6. A shop advertises ‘Buy one, get one at half price’. For this offer, the average cost per item is the same as:
- A Two for the price of one
- B Three for the price of one
- C Three for the price of two
- D Four for the price of three
- E Five for the price of four
Intermediate Mathematical Challenge 2005, Question 6. © UK Mathematics Trust. Original paper on ukmt.org.uk
Answer: D Four for the price of three
The offer gives the purchaser two items for the price of one and a half items. So the average cost per item is the same as four items for the price of three.
Solution © UK Mathematics Trust, from the IMC 2005 solutions.