Solve this using Linear programming and solver (excel), and please show the solver steps

The Chamber of Commerce regularly sponsors seminars and public service programs. Currently, promotional plans for this year's show are underway. Advertising alternatives include television, radio, and newspaper. Viewership estimates, costs, and maximum media usage limitations are shown below:

Restriction	TV	Radio	News Paper
Audience per ad	100,000	18,000	40,000
Cost per ad	U$2000	U$ 300	U$ 600
Maximum use of the medium	10	20	10

To guarantee a balanced plan, radio ads must not exceed 50% of the total number of ads allowed. In addition, television must constitute at least 10% of the total number of authorized advertisements.

a. If the promotional budget is limited to $18,200, how many commercial messages must be handled in each medium to maximize total audience contact? What is the budget allocation between the three media, and what is the total audience reached?

b. How much would audience contact increase if an additional $100 were allocated to the promotional budget?