A small business makes 3 -speed and 10 -speed bicycles at two different factories. Factory A produces 163 -speed and 2010 -speed bikes in one day while factory B produces 12 3 -speed and 2010 -speed bikes daily. It costs $1000/ day to operate factory A and $800/ day to operate factory B. An order for 963 3-speed bikes and 140 10-speed bikes has just arrived. How many days should each factory be operated in order to fill this order at a minimum cost? What is the minimum cost