TransactionID    Brand    Memory    Disk    SoldPrice
1                Lenovo   1G        60G     $100
2                IBM      NA        60G     $150
3                Lenovo   4G        NA      $200
...

SoldPrice    Attribute    Value
$100         Brand        Lenovo
$100         Memory       1G
$100         Disk         60G
$150         Brand        IBM
$150         Disk         60G
$200         Brand        Lenovo
$200         Memory       4G

P(Price|Brand*Memory*Disk) = P(Price|Brand) * P(Price|Memory) * P(Price|Disk)