Gemini 3.1 Pro Preview vs Gemini 3.5 Flash for bookkeeping

**1. Work out the difference**
The bank statement closing balance is £8,412.55. 
The cash book closing balance is £8,376.55. 
The difference is **£36.00** (£8,412.55 - £8,376.55). 
*(Note: The outstanding unpresented cheque and uncredited lodgement of £120.00 perfectly cancel each other out, so they do not affect this £36.00 difference).*

**2. What kind of error is it?**
This is a **transposition error** (specifically, reversing two adjacent digits when recording a number). 

**3. The arithmetic rule that identifies this class of error at a gl…

Here is the step-by-step analysis and solution to the bookkeeper's bank reconciliation issue.

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### 1. The Difference
*   **Adjusted Bank Balance:** £8,412.55 (The £120.00 unpresented cheque and £120.00 outstanding lodgement cancel each other out).
*   **Cash Book Balance:** £8,376.55
*   **The Difference:** £8,412.55 – £8,376.55 = **£36.00** (The Cash Book is short by £36.00).

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### 2. The Kind of Error
This is a **transposition error**. 

Looking at the transaction list, the bookkeeper has swapped the digits of a transaction. Specific…