What average price have "Any Other" backers layed Sam at?

Sam       10.5       £30.00       £315.00 £285.00
Ref: Bet matched:
    11.5     £30.00     £345.00 £315.00
Ref: Bet matched:
    12     £12.00     £144.00 £132.00
Ref: Bet matched:
    20     £50.00     £1,000.00 £950.00
Ref: Bet matched:
    25     £20.00     £500.00 £480.00
Ref: Bet matched:
    28     £10.00     £280.00 £270.00
Ref: Bet matched:
    34     £10.00     £340.00 £330.00
Ref: Bet matched:
    38     £10.00     £380.00 £370.00