MRG interest:- As per the process, the system takes EOD margin or Peak Margin whichever is higher for Derivatives trades while calculating the Interest due to which the MRG interest was charged. You need to maintain a 50:50 ratio that is 50% in the trading account and if 50% collateral is not maintained then the interest charges of 0.0438% per day on non-maintenance of a 50:50 margin will be applicable.
DPC interest refers to delayed payment charges which is levied when the ledger becomes negative due to any reason. We have explained in detail about this in our community post below :