I have a sheet setup to record my gas usage. The sheet is setup like so:

Week | gallons | price | vehicle | gallons | price | vehicle | and so on.
1 3.23 $3.50 Bike 3.45 $3.89 stang .......
2 3.23 $3.50 Bike 3.45 $3.89 bike .......
3 3.23 $3.50 stang 3.45 $3.89 bike .......


I want to look take all of the information at the end of the week and find
out how much i spent on my car and how much i spent on my bike. I want to
have a column on the right side of my sheet that will reference only the
cells that are labled bike and add them up and put the total amount of money
I spent in gas for my bike in that week. and the same for my mustang.