None of them stayed in 9 yuan, which means 3*9=27 yuan. In this 27 yuan, the waiter took 2 yuan and the boss took 25 yuan. It has nothing to do with the old 30 yuan. 30 yuan is just a confusing factor.

He said that the onion is 70 cents and the onion is 30 cents, but the actual sum is 2 Jin 1 yuan, which is different from the original 1 Jin 1 yuan, so he finally paid 50 yuan, which is the fault of the onion seller. If the onion is 1 kg 1 yuan, it should be onion 65438+.

Tired of playing with hands, I hope to adopt.