Windless surfing company’s marketing manager observes that if the price of designer windsocks is $45, then on average 75 windsocks are sold per month. experience has shown that if the price is raised from $45, then for every $1 increase in price, three fewer windsocks are sold each month. a. write an equation for the number of windsocks sold per month in terms of the price. b. what price results in zero windsocks per month being sold? c. if the manager wants to sell at least 60 windsocks each month, what range of possible prices for the windsocks must she set?