3. a. In column G, Brett wants to calculate the number of days the invoice is overdue. If the age of the invoice is greater than 30 days, it is overdue. Calculate the days overdue as follows: In cell G6, insert a formula using the IF function that tests whether the age of the invoice (cell F6) is greater than 30. b. If the age of the invoice is greater than 30, subtract the due date (cell E6) from the current date (cell B3). If the age of the invoice is less than or equal to 30, display o to show that the invoice is not overdue. d. Use an absolute reference to cell B3 in the formula. Use the Fill Handle to fill the range G7:15 with the formula in cell G6, filling the range without formatting c