A business owner has recruited an intern to find a good inventory ordering strategy $($i$.$e$.,$ finding the optimal order quantity and other useful information$).$ Below is the summary of intern's analysis:

The business owner has implemented the intern's suggested strategy $($placing an order for $78$ units every $6$ days$).$ While the input values in the intern's work have been correct, it has come to light that the intern heavily relied on ChatGPT for the analysis. The owner is now interested in verifying the accuracy of the intern's work.

Please review the intern's analysis, and verify its accuracy. If you identify any issue$($s$),$ explain the reasons for your concerns, and propose any necessary revisions. Please use cell addresses to refer to values in the worksheet.