Best Buys (Edexcel IGCSE Maths A (Modular))
Revision Note
Best Buys
If there is more than one deal on offer, how do I work out which deal is best?
Find the price of 1 item (by dividing the number of items and total price by the same scale factor)
E.g. If 3 tins cost £1.20 then 1 tin costs 40p (by dividing both quantities by 3)
Compare the prices of 1 item from each shop / deal to see which is cheaper
The cheaper deal is the better value for money
E.g. 1 tin costs 40p from shop A and 45p from shop B
1 tin at shop A is cheaper than at shop B
Shop A is therefore the better value for money
For more complicated deals, write down each line of working clearly
Worked Example
Two deals for buying caps are given below:
3 caps for £22.50 from Baseball World
5 caps for £36 from Head Hut
At which shop are the caps better value?
You must show your working.
Find the cost of 1 cap from Baseball World (by dividing £22.50 by 3)
22.50 ÷ 3 = £7.50 for 1 cap from Baseball World
Find the cost of 1 cap from Head Hut (by dividing 36 by 5)
36 ÷ 5 = £7.20 for 1 cap from Head Hut
Compare the price of 1 cap from each shop to see which is cheapest
£7.20 is cheaper than £7.50
Write down, with reason, the shop with better value
1 cap from Head Hut costs £7.20 and 1 cap from Baseball World costs £7.50
£7.20 is cheaper than £7.50 so Head Hut is better value
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