you prepare if you want to prepare 10 4 copies of a 272-bp ds DNA molecule for a copy number standard of PCR using the stock DNA solution of 1 mg/mL?…

How would you prepare if you want to prepare 104 copies of a 272-bp ds DNA molecule for a copy number standard of PCR using the stock DNA solution of 1 mg/mL? MW of a 1-bp dsDNA is 660 g/mole.