A story be using the opening line is developed below.

Explanation:

............. Their names were Mangal and Nath. They both were good friends and used to sit and talk together. One day, they both went to city's fair. They both saw that people are buying different types of products at higher prices. They noticed them and decided to start a new business in the fair, so that, people can buy products and they both can become rich. One day, Mangal got ill and was not able to set his business in the fair. Nath went to the fair and set his stall of snacks and drinks, people loved those snacks and, just in one day, Nath earned a lot money that made him wealthier than Mangal. After four days, Mangal got well and went to Nath's home, he saw that Nath was wearing luxurious clothes and eating expensive food with his family. He got shocked that how he got so much rich in just four days. He asked Nath that,"How you got so rich?" but after listening that, Nath reacted so bad and said- Get out! you poor person, you are not my friend anymore. This made Mangal upset and he returned to his home.

After this incident, their friendship got finished.