Final answer:
To multiply the contents of cell B8 and the named range TaxRate in cell B9 and AutoFill the formula to cell M9, you would enter the formula '= B8 * TaxRate' in cell B9. Then, drag the small square handle in the bottom right corner of cell B9 to cell M9 to copy the formula and update the cell references.
Step-by-step explanation:
To multiply the contents of cell B8 and the named range TaxRate in cell B9, you would enter the formula = B8 * TaxRate in cell B9. Then, to AutoFill the formula to cell M9, you can click and drag the small square handle in the bottom right corner of cell B9 to cell M9. This will copy the formula to the desired range and update the cell references accordingly.