Help! I keep getting N/A or VALUE errors!

Columns and Cells Name

1. Activity Type Drop Down Options: Dme, O&m, blank (A3:A11)
2. Cost if activities are DME (B1)
3. Cost if activity if O&M (C1)

If all cells in 1 are DME, then 2 = $1 and 3=$0
If all cells in 1 are O&M, then 3=$1 and 2=$0
If cells in 1 are mixed O&M and DME, then 2=$.5 and 3=$.5
If all cells in 1 are blank, then 2=$0 and 3=$0