You have just inherited $520,000. You plan to save this money and continue to live off the money that you are earning in your current job. If you can invest the money in a bond that pays 4.00 percent interest annually, how long will it be before your inheritance is worth $1 million? (If you solve this problem with algebra round intermediate calculations to 5 decimal places, in all cases round your final answer to 2 decimal places, e.g. 8.72.)