A king cheated the richest man out of all his property with a math problem. What happened?

The king was Zhu Yuanzhang, and the richest man at that time was Shen Wansan. At that time, Zhu Yuanzhang wanted to punish Shen Wansan, but for no reason, he had to give Shen Wansan a math problem. At that time, Zhu Yuanzhang said that he would take a penny as capital, and then the interest added every day would be half of this amount. It is such a simple math problem that Shen Wansan lost all his possessions.

Shen Wansan had a lot of wealth because of its overseas trade at that time. He has a lot of original capital and made a lot of money by commercial activities such as real estate investment. Later, the business scale became larger and larger, and he became the richest man in the Ming Dynasty. After Shen Wansan became the richest man, he gradually expanded. At that time, Shen Wansan helped Zhu Yuanzhang build Nanjing and asked Zhu Yuanzhang to pay interest. You know that the whole world belongs to Zhu Yuanzhang, so how can Shen Wansan, as a courtier, ask his boss for benefits? So Shen Wansan's behavior annoyed Zhu Yuanzhang at that time. At that time, Zhu Yuanzhang wanted to punish Shen Wansan, and there was no clear reason, so he had to find a way to punish Shen Wansan from other places. Fortunately, Zhu Yuanzhang had his think tank at that time. At that time, the think tank came up with a very good idea for him. At that time, Zhu Yuanzhang felt very wonderful after hearing this idea and adopted it. Zhu Yuanzhang called Shen Wansan to his side and told him that a penny is his capital, and the interest to be added every day is half that of the day before yesterday. At that time, they made a bet on a deadline, and Shen Wansan agreed to Zhu Yuanzhang's request at that time. At that time, Shen Wansan didn't expect it to be severe, but agreed simply. But what he didn't expect was that on the fifth day, the capital city had arrived at 16, and a month later, Shen Wansan's years of accumulation had all been handed over to Zhu Yuanzhang. At that time, Shen Wansan regretted agreeing to Zhu Yuanzhang's request, but you didn't joke that it would be a crime to cheat you on the spot, so Shen Wansan could only bear the result.