Peter is making quarterly contributions of of $300 to his savings account which pays interest at the

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Question:

Peter is making quarterly contributions of of $300 to his savings account which pays interest at the APR of 8.2%, compounded quarterly. Right after Peter makes his 40th contribution, the bank changes the APR to 6% and Peter makes 39 more $300 contributions.

What is Peter's balance right after his last contribution?