Jana puts $1,000 in her savings account, which pays 4% compound interest. Assuming that (1) the interest rate doesn't change and (2) Jana neither withdraws nor deposits additional funds, approximately how long will it take for her account balance to double?

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Jana puts $1,000 in her savings account, which pays 4% compound interest. Assuming that (1) the interest rate doesn't change and (2) Jana neither withdraws nor deposits additional funds, approximately how long will it take for her account balance to double?