The amount A of dollars accumulated after t years through an investment of Ao dollars at an interest rate of r, compounded continuously, can be determined from the function A = Aoe. The doubling time of an investment is the time required for an investment to double in value. Find the doubling time (rounded to 3 decimal places) for an investment made at a. 6 % interest compounded continuously. years b. 7 % interest compounded continuously. years c. 10 % interest compounded continuously. years

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