please help solve part b, thank you!

Problem 4-01 (Algorithmic) The Westchester Chamber of Commerce periodically sponsors public service seminars and programs. Currently, promotional plans are under way for this year's program. Advertising alternatives include television, radio, and newspaper. Audience estimates, costs, and maximum media usage limitations are as shown: Constraint Television Radio Newspaper Audience per advertisement 100000 18000 40000 Cost per advertisement $1400 $300 $600 Maximum media usage 10 20 10 To ensure a balanced use of advertising media, radio advertisements must not exceed 50% of the total number of advertisements authorized. In addition, television should account for at least 10% of the total number of advertisements authorized. a. If the promotional budget is limited to $21,200, how many commercial messages should be run on each medium to maximize total audience contact? What is the allocation of the budget among the three media? If required, round your answers to the nearest dollar. Let T = number of television spot advertisements R = number of radio advertisements N = number of newspaper advertisements Budget ($) T = 10 14000 R= 4 1200 N = 10 6000 Total Budget 21200 What is the total audience reached? Round your answer to the nearest whole number. 1472000 b. By how much would audience contact increase if an extra $100 were allocated to the promotional budget? Round your answer to the nearest whole number