95.6 yuan.

if 4, yuan is used to buy a bank-guaranteed floating income wealth management product, its yield is about 2.87%, and it will earn about 95.6 if it is held for one month. Calculation method: (4, times 2.87%) divided by 36 days times 3 days, so the monthly income is about 95.6 yuan.

4, yuan can buy the following wealth management products: 1. Fixed investment in the fund means investing in the designated open-end fund with a fixed amount at a fixed time. For investors with only 4, yuan, they can choose a fund with a fixed investment of several hundred yuan per month in exchange for time. 2. Reverse repurchase of national debt, which means that individuals lend their own funds through the national debt repurchase market to obtain fixed interest income. 3. New convertible bonds. Convertible bonds are bonds issued by listed companies to the public for financing. The listed companies repay the principal and interest at maturity. At the same time, after the convertible bonds are listed, investors can choose to sell them. Generally speaking, as long as they are not broken, investors can earn a certain price difference. Investment and financial management should be cautious, for reference only.