I'm quite handy with spreadsheets but this one's got me stumped!

I want to create an spreadsheet that will calculate the interest earned
in a year through investment of UK premium bonds. Its not quite as
simple as it seems as I have made monthly payments and have not had the
full total for the full 12 months. See below:

Year 1

Jan
Feb
Mar
Apr
May deposited 1500
Jun
Jul deposited 2500 and won 50
Aug won 50
Sep deposited 6000 and won 50
Oct deposited 2000
Nov
Dec

TOTAL investment 12000
Total winnings 150

So as you can see I have invested 12000 but over the course of a full
year and have received back 150 but what is the interest rate? I need
to calculate the interest based on the number of months I've held each
deposit for.

Can anyone crack this?


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sparker3000
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