We have that the total account for Mark is $25.
He spends:
1. $9.00 playing in the arcade.
2. $12.00 buying a remote control car.
3. $2.50 buying a giant soda.
Therefore, the amount of money he still has is:
$25 - $9 - $12 - $2.50 = $1.50
Therefore, he still has $1.50.