please dont solve if you are not 100% sure, i will downvote if answer is wrong The proportion of people responding to an advertisement of a new product in a certain marketing area is given by (1-e0.3r), where t is the number of days the advertisement runs. The marketing area contains 4,00,000 potential customers and each response to the advertisement results in an average profit of 2. The profit is exclusive of advertising cost. The fixed cost of producing the advertising is 30,000 and the variable cost is 4,000 for each day the advertisement runs. How many days should the advertisement run to maximize total net profit.