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9. How long will it take $12,000 to grow to $15,000 if the investment carnes compounded continuously? to grow to $15,000 if the investment carns interest at the rate of 4%/year 10. To save for the down payment of a house, the Johnsons decide to deposit $350 at the end of every month into a bank account paying interest at the rate of 7.5% per year compounded monthly. If they started saving in June 2005, how much do they have in the account at the start of December 20197