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16 October, 23:59

The balance of Chiaki's average balance checking account at the beginning of the last cycle was $100, and the only transaction for the cycle was a check that Chiaki wrote for $20, which cleared exactly halfway through the cycle. On what amount did Chiaki's checking account pay interest last cycle?

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  1. 17 October, 00:23
    0
    The correct answer is $90
  2. 17 October, 00:24
    0
    She had $100 for the first half through the cycle.

    Chiaki wrote a cheque for $20.

    Now she had $80 for the second half through the cycle.

    Therefore:

    Amount = (1/2) * 100 + (1/2) * 80

    Amount = 50 + 40

    Amount = $90
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