| Name | Price | Quantity | Total |
|------+-------+----------+-------|
| foo  |     7 |        4 |    28 |
| bar  |   3.5 |        3 |  10.5 |
|------+-------+----------+-------|
|      |       |        7 |  38.5 |
#+tblfm: $4=$2*$3::@>$4=vsum(@2..@-1)
#+tblfm: @>$3=vsum(@2..@-1)