A new book store is considering a social media marketing campaign, offering a $15 discount for purchases over $75 before taxes on their first visit. The cost of the social media campaign is estimated at $50,000, and would likely increase revenue by $200,000 to a total revenue of $650,000. The contribution margin of the campaign is estimated to be 45%. What range does the ROM of the campaign fall into?

a.300%-400%

b. 200%-250%

c. 75%-85%

d. 35%-45%