According to relevant information, the highest trust interest rate is 7.5%, 500 million x 7.5% = 3750 million, and 37.5 million divided by 12 months equals 3125,000 yuan.

Trust refers to the act that the principal entrusts his property rights to the trustee based on his trust in the trustee, and the trustee manages and disposes in his own name for the benefit of the beneficiary or for a specific purpose according to the wishes of the principal.