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A level Mathematic p2 Question chapter 5

I invest £A in the bank at a rate of interest of 5% per annum. How long will it be before I double my money?
Original post by e8ksha
I invest £A in the bank at a rate of interest of 5% per annum. How long will it be before I double my money?

Not sure which A Level spec or book you're looking at, but the formula for compound interest is:

Future Value = Present Value * (1 + interest rate)^years

I cannot give you the answer, since it's against TSR's policies.

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