18. Suppose that P dollars in principal is invested in an account earning 2.1% interest compounded continuously. At the end of 2 yr, the amount in the account has earned $193.03 in interest. a. Find the original principal. Round to the nearest dollar. (Hint: Use the model A = Pe" and substitute P+ 193.03 for A.) b. Using the original principal from part (a) and the model A=Pe", determine the time required for the investment to reach $6000. Round to the nearest tenth of a year.

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