A CNC (computer numerically controlled) machine is used to produce three types of parts. After producing one type of part, the machine requires a 2.5 hour setup before the next type of part can be produced. When producing, the machine can make 115 parts per hour. Demand for part A is 10 units per hour. Demand for part B is 25 units per hour. Demand for part C is 50 units per hour. How many units of part A should be produced in each batch?