Ahardware store will run an advertising campaign using radio and newspaper. every dollar spent on radio advertising will reach 60 people in the "under $30,000" market, and 40 people in the "over $30,000" market. every dollar spent on newspaper advertising will reach 80 people in the "under $30,000" market, and 20 people in the "over $30,000" market. if the store wants to reach at least 102,000 people in the "under $30,000" market and 120,000 people in the "over $30,000" market, how much should it spend on each type of advertising to minimize the cost?