Buy a laptop, help fund a Linux Indy car

See here. For every laptop sold, this company is donating ten bucks to the Tux500 Linux Indy car effort. Which is no doubt why their total has now soared to $12,158.13, up from $12,003.34 on Friday. That’s like 15.3 laptops in just three days. Question: Why the hell is the total amount raised not a round number? Is someone actually sending in pennies?