Laugh loudly in classical Chinese

Because Feng Xu is panting, let's talk about a pair of boots that cost 900 pounds. A man bought the same boots as him but spent 1800. The man was anxious and asked him why. Feng Xu also said that the other one was 900, because he pointed to one foot and only said the price of one shoe. Premier Feng Dao and Prime Minister Ning He are together in the official office of the Prime Minister's Office. One day, Ning He asked Feng Dao, "How much are your new boots worth?" Feng Dao showed Ning He his left foot and said, "Nine hundred." Tired of waiting, Ning He hurried back to the beadle and said, "Why did I use 1,800 boots?" So, I scolded the petty officials for a long time. Feng Dao then slowly raised his right foot and said, "This one is also 900." So it caused a burst of laughter. At that time, some people said, the prime minister is still so, how to convince his ministers?