Suppose that P dollars in principal is invested in an account earning 3.9% interest compounded continuously. At the end of 4 yr, the amount in the account has earned $1603.85 in interest. Part 1 of 2 (a) Find the original principal. Round to the nearest dollar. (Hint: Use the model A =Pe" and substitute P+ 1603.85 for A.) The original principal was approximately $ 9500 Part: 1/ 2 Part 2 of 2 (b) Using the original principal from part (a) and the model A =Pe", determine the time required for the investment to reach $11,000. Round to 1 decimal place.

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