It costs 50 to find out whether a spare part required for repairing a failed device is faulty or not. Installing a faulty spare part causes a damage of 1000. Is it on average more profitable to use a...

It costs
50 to find out whether a spare part required for repairing a failed device is faulty or not. Installing a faulty spare part causes a damage of
1000. Is it on average more profitable to use a spare part without checking if

(1) 1% of all spare parts of that type

(2) 3% of all spare parts of that type

(3) 10 % of all spare parts of that type are faulty?