7. An investor bought stock for $20,000. Ten years later, the stock was sold for $40,000....

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7. An investor bought stock for $20,000. Ten years later, the stock was sold for $40,000. If interest is compounded continuously, what annual nominal rate of interest did the original $20,000 investment earn? 7. An investor bought stock for $20,000. Ten years later, the stock was sold for $40,000. If interest is compounded continuously, what annual nominal rate of interest did the original $20,000 investment earn?