Mitsubishi Repair: water pump and timing belt, mechanic shop, timing belt

Question
what is the adverage cost to pay for replacementof these parts.

Answer
James,
It all depends on the year, make, model, and style of the car in question.  Plus, it depends if a mechanic finds other problems while he's in there.  But if all goes well, a water pump and timing belt placement can cost any where from $450-$600 from your average mechanic shop.  That includes parts and labor.