Question

A certain type of chocolate bar is sold as follows.


Single chocolate bar: 82p, or buy one get one half price

Packs of 5: £3, offer: 2 packs for £5.75

Packs of 10: £6 each


What's the cheapest way of buying exactly 38 chocolate bars without any extra?

Find the amount of each type of pack or single bar you need and the total cost of buying 38 packs.

Answer 1

Answer:

Step-by-step explanation:

You would never buy a 10-pack, because two 5-packs cost less.

To buy 3 bars you need a single bar and a pair of single bars for £0.82 + £0.82+ £0.41 = £2.05

To buy 30 bars you need 3 pairs of 5-bar packs = 3×£5.75 =  £17.25

To buy the remaining 5 bars you need one 5-bar pack = £3

cost = £2.05 + £17.25 + £3 = £22.30