These documents might be useful to you while taking part in Challenge 5: The Cash. Read them before the challenge day so that you have some background and understanding of these financial issues!

An introduction to Tax VAT and NIC.pdf  (2 pages, 78kb)
Business finance terminology.pdf (6 pages, 94kb) 
How to forecast sales.pdf (4 pages, 193kb)
Preparing and submitting company accounts.pdf (3 pages, 82kb)
Tax allowable business expenditure.pdf  (3 pages, 74kb)
Understanding financial ratios.pdf  (4 pages, 82kb)

...Good luck on the day!