Okay lets sort this out....
First thank you dzug for your comments, of course what you say is perfectly true. I was just making a point that your chances of 'winning' the jackpot is a no hoper near enough'. However yes you can win �50 at odds of 29,000 to 1 for every pound and maybe you could win �100 at 100,000 to one.
BUT all that is just a psycological ploy to make you think that you save and win money at the same time. When in fact with your 3.6% and 29,000 to 1 odds of winning that �50 you're no better off, in fact worse off than having a regular savings account that gives you your interest every month drip drip drip....no gimmocks no BS!
So in conclusion johnny37 in answer to your original question: If �5000 over 46 months earns $450 interest, what is the interest rate?
Answer: Absolute pants!