Hi,

Sorry if this is in the incorrect section, I really couldn't see anywhere else more relevent.

Problem:

In my line of work, prices of my contracts vary annually via a retail price index. Between 2010 and 2011 this rose by 4.64%.

For example: Lets say I have a contract in 2010 priced at £10,000. I add 4.64% and we get £10,464 for 2011 that's no problem. However, lets say 6 months later I lose the 2010 paperwork and have completely forgotten the details for 2010 which I need to replace. I know the rise was 4.64% and I know it rose to £10,464. What calculation would I use to work out the previous figure of £10,000?

I also asked this on Yahoo and was told to divide 10,464 by 1.0464 to get 10,000. This works out but how do you get to 1.0464 without knowing the 10'000 figure? (10,464 / 10,000?? But I lost the paperwork for 2010, so I have no idea about the figure '10,000' remember)

Hopefully an easy one for yourselves