Show me the steps to solve Applying Excel $1$: Calculating totals

A spreadsheet has $4$ columns and $7$ rows. Row $1$ in column $1$ is titled $$Expenses$.$ Rows $2$ to $6$ in column $1$ list various types of expenses. Rows $2$ to $5$ in column $2$ contain dollar amounts. Row $6$ in column $3$ is highlighted.