Confused puppy
The annual Animal Festival is here, and the forest is full of festive atmosphere. There are busy traffic, people coming and going, and it is very lively. Shops and roads are filled with goods everywhere. There is a dazzling array of things.
Some time ago, the puppy opened a fruit shop with the help of his father. Early this morning, he took out all the fruits such as apples, peaches, grapes, and Sydney that his father had brought from other places, hoping to sell them at a good price. But by the lunch hour, the rest of the fruits were sold out, that is, the 30 kilograms of Xinjiang peaches and 30 kilograms of green peaches could not be sold. The price has been discounted by 20%. The peaches are 4 yuan per 500 grams and the green peaches are 2 yuan per 1,000 grams, but no one sells them yet. You should know that both peaches and green peaches are "noble" fruits, which will go bad overnight. The puppy was anxious like an ant on a hot pan—turning round and round.
Just then, the puppy's fellow fox came. As soon as he entered the door, he hushed and asked Nuan: "Puppy, how is the business? Do you want me to help?" "Ah! Don't mention it!" Don’t go out?” The fox listened, his eyes rolled, and he came up with an idea, “Brother Dog, you are so stupid. Although peaches are delicious but expensive, green peaches are cheap but not delicious. Of course they won’t buy them! Look, the peaches are 4 yuan per 500 grams, and the green peaches are 2 yuan per 1,000 grams. You might as well mix the two peaches for 1,500 kilograms for 6 yuan, which is easy to sell and save trouble." The fox's method did it.
The effect is really good. In the evening, both peaches were sold out. The puppies hummed a small song and began to count the money happily, but they couldn't help but frowned: They were sold at the original price, and the puppies were already considered good. They should earn a total of 300 yuan, but now they only sell 4× (30+30)=240 yuan, which is 300-240=60 yuan. The puppy hunched over and looked for the 60 yuan, but after looking for it for a long time, he couldn't find it. What's the matter?
It was the neighbor Lamb who helped the puppy to solve the mystery: peach 4 yuan 500 grams, green peach 2 yuan 1000 grams, mixed together 6 yuan 1500 grams, at first glance, it is quite reasonable, but when you think about it, you will find that, When sold separately, the average energy of two peaches per 1000 grams (4×2×30+2×30)÷(30+30)=5 yuan, but now they can only sell 6÷(1500÷ 1000)=4 yuan. You see, in this way, an average of 1 yuan per 1,000 grams is lost, which is exactly 1×(30+30)=60 yuan!
The puppy was very upset when I heard it: Why don't I know the secret? The neighbors said: What a confused puppy, who told you not to study hard!
From then on, when the puppy has free time, he will no longer be greedy for fun, but calm down and study hard.