Competition between locksmiths

Now the competition between locksmiths is getting bigger and bigger. There are dozens of door faces for unlocking and matching keys in a small county. Recently, another one has been opened, which is the lowest price. The original price of the step-by-step lock is 15 yuan, the lock core is 20 yuan, and the lock body is 200 yuan. Now it is good. This locksmith tool shop has 8 yuan for the step-by-step lock, changing the lock core 50, the lock body 80, the price of everyone is very low, often in this case, everyone has no business, the locksmith can not compete in this way, dare to take the world, everyone negotiated, set the key to 5 yuan together. But we are still very depressed.