You have decided to award a 10% discount to a valuable customer and in D2 you want to calculate the discount amount that will appear on their monthly invoices. You have typed 10% into A2, and you know that if you multiply the monthly total in C2 by A2, Excel will work out the 10 percent. You also want to be able to use the Autofill feature to copy this formula for the other three months. Which formula below would work out the correct result for you?