Answer this question according to the relevant formulas, rules and calculation methods of mathematical calculation. It is normal for pharmacies to have a gross profit margin of 20% in the past two years. If it is higher than this gross profit margin, it is a violation of price management and should be handled and punished by relevant departments. For the health and interests of the people, the relevant departments should do a good job in the supervision and management of drug prices, and the gross profit margin of 30% is relatively normal to pay the labor rent and maintain daily operation.