Three ice cream shops have provided quotes for catering martina’s ice cream party. each store charges a delivery fee in addition to a price per person. each store gives martina its pricing plan in a different way, as shown below, where c is the total cost in dollars and n is the number of people who will attend the party. igloo ice: c(n) = 1.75n + 75 fred's freeze: c(n) = 2n + 80 tasty treats: c(n) = 1.25n + 90 which store has the lowest delivery charge: igloo, fred's, or tasty?