Accounting choices have consequences
Teams start with the methods the instructor picked at setup, and can ask to change one, with a written reason. The instructor approves or declines, and an approved change is disclosed in the notes, as the standards require.
The Careless team switched depreciation to declining balance in Quarter 6. Depreciation rose from $2.4M to $4.2M a quarter, which on its own takes about $1.3M off after-tax profit. The machines, the orders and the sales are exactly the same. Only the reported expense moved.
The point for your course
A change in method moves reported profit, not the business. Students see it happen to a firm they know.