A new start up company wants to promote sales by putting at most 10 ads in the most read 3 newspapers of the town. Each ad in newspaper A costs $200 and is read by 2000 people. Each ad in newspaper B costs $100 and is read by 500 people. Each ad in newspaper C costs $300 and is read by 5000 people but newspaper C does not accept more than 4 ads from any company. The company wants at least 25000 people to read its ads. Write a mathematical model that will calculate the number of ads the company should place in each paper to minimize the advertising costs. (DO NOT SOLVE!) Don't forget to define the decision variables