Elizabeth Bailey is the owner and general manager of Princess Brides, which provides a wedding planning service in southwestern Louisiana. She uses radio advertising to market her business. Two types of ads are availablethose during prime-time hours and those at other times. Each prime-time ad costs $390 and reaches 8,200 people, while the off-peak ads each cost $240 and reach 5,100 people. Bailey has budgeted $1,800 per week for advertising. Based on comments from her customers, Bailey wants to have at least two prime-time ads and no more than six off-peak ads.If 10 percent of the unemployed find a job each month, how long is the average unemployment spell