BrainBashers - Brain Teasers and Puzzles

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Puzzle 565

The local CD shop operates an unusual discount policy. The discount on the next purchase is worked out on the current purchase in the following way: for every whole pound spent you get 0.5% discount on the next purchase. For example, if you purchased £8.99 on the first purchase, you would then get a 4% discount on the next purchase and so on. You can make as many purchases as necessary.

You need to buy 7 CDs, costing, £11.50, £12.00, £12.00, £12.50, £13.00, £13.00 and £14.50. What is the cheapest method of buying them?

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Puzzle 566

What comes next in this sequence:

jnry fbrry mrch prl my jn ?

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Puzzle 567

What comes next in this sequence:

2 3 5 7 11 31 71 91 ?

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Puzzle 568

Which letter comes next in this sequence:

A K Q J ?

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