Calculate Apple’s ROI, showing margin and turnover, for the years ended September 26, 2020, and September 28, 2019.

To calculate Apple's ROI (Return on Investment), we need two key pieces of information: Net Profit and Total Investment. However, these figures are not provided in your question.

The formula for ROI is:

ROI = (Net Profit / Total Investment) * 100%

Margin and turnover are also calculated differently:

1. Profit Margin is calculated as Net Profit / Total Revenue. This shows what percentage of sales is turned into profit.

2. Asset Turnover is calculated as Total Revenue / Total Assets. This shows how efficiently a company uses its assets to generate sales.

Without the specific figures for Apple's net profit, total investment, total revenue, and total assets for the years ended September 26, 2020, and September 28, 2019, I'm unable to calculate the ROI, margin, and turnover.

You can usually find these figures in the company's annual report or financial statements. Once you have these figures, you can use the formulas above to calculate ROI, margin, and turnover.