The interest on the perpetual bonds of Evergrande Group is calculated according to coupon rate. Interest = purchase price x interest rate, the purchase price is the original purchase amount, and the profit can be found on the face.

Perpetual bonds are bonds that have no maturity date and investors can earn interest permanently according to coupon rate. According to Hong Kong's accounting standards, perpetual bonds are counted as rights and interests, and the use of funds is more flexible than bank development loans, so they are sought after by large real estate enterprises.