$3\mathrm{.}1$ Complete the

Megabytes Used row $($G$4$:L$4)$ of the Usage Summary table on the Data worksheet.

a$.$ Build the formula to calculate total Megabytes Used for January $($G$4),$ by referencing the month name in G$3$ and the approprlate columns in the data table $($B$3$:D$183).$

b$.$ Reuse your formula to calculate the Megabytes Used for the other months.

c$.$ Notice that the "Glgabytes Used" $($G$5$:L$5)$ row is already completed in the worksheet. "Gigabytes Used" is calculated as the "Megabytes