I would like to know if there is a simpler way copy this function: =SUM(C3:F3)*105
instead of editing each cell's formula. I have entered a different value in each column in row 3; I need to include the values to get the current sum.
I have each column as a month and I am entering the number of homes sold (per month) then I need to know how much assessment is due currently - which would be value of SUM(C3:F3)*105

JANUARY FEBRUARY MARCH

4 4 5
$420.00 $840.00 $1,365.00
$80.00 $160.00 $260.00