Charlotte is in the business of manufacturing phones. she mush pay a daily fixed cost to rent the building and equipment, and also pays a cost per phone produced for materials and labor. The labor and materials cost $100 for each phone manufactured, and the total cost of producing 8 phones in a day would be $1300. Write an equation for “C”, terms of “p”, representing total cost, in dollars, of producing “p” phones in a given day.