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Answer:

The student likely made an error by not properly distributing the P in the equation A = P(1 + rt) or by forgetting to divide by P when isolating r. To solve correctly, you first distribute P to get A = P + Prt. Then, subtract P from both sides to get A - P = Prt. Finally, divide both sides by Pt to isolate r, resulting in r = (A - P) / (Pt).