Best Buys Flashcards

All 6 cards in this deck

In a 'best buy' question, what makes one option better value for money?

The one with the lower cost per unit (or the greater amount per pound).

What are the steps to compare two packs using cost per unit?

e.g. 500 g for £2.00 or 800 g for £3.00

1. Divide price by quantity for each: $200 \div 500 = 0.4$p per g; $300 \div 800 = 0.375$p per g
2. The lower cost per unit is better value: the 800 g pack.

How do you compare value for money using the amount obtained per pound?

e.g. 500 g of rice for £2

Divide the quantity by the price: $500 \div 2 = 250$ g per £; the larger amount per £ is better value.

True or false? In a best buy question, the pack with the lower price is the better value.

False. You must compare cost per unit (or amount per pound), since the packs contain different quantities.

How do you find the cost per item of a '3 for the price of 2' style offer?

e.g. 3 tins for the price of 2 at £1.50 each

Divide the total paid by the total number of items received: $£3.00 \div 3 = £1.00$ per tin, then compare with the other offer.

What are the steps to find the cheapest way to buy a required amount sold in fixed pack sizes?

e.g. need 20 eggs; packs of 6 cost £1.20, packs of 12 cost £2.00

1. List combinations giving at least the amount needed: $2\times12$, $12+6+6$, $4\times6$
2. Work out each total cost: £4.00, £4.40, £4.80
3. Choose the lowest total: two 12-packs, £4.00