A pharmacist needs to weight 0.02 grams of tretinoin to compound a cream. The balance to be used has a sensitivity requirement of 0.015g and an acceptable error of no greater than 5%. The pharmacist had made the necessary calculation and prepared the stock mixutre but seemed to have misplaced the calculations record. How many mg of the diluent was mixed with the least weighable quantity of the drug to make the stock mixutre if the pharmacist used 300 mg of stock mixture to deliver the required 0.02 grams of tretinoin