Determining Sales from Given Data. Cathy's Calculator Company requires ten numbered buttons for every hand calculator produced. During June, 20x0, 350,000 buttons were purchased. Information regarding inventories is shown below: Required: June 1, 200 June 30, 20x0 Buttons Calculators Work-in-process 40.000 35,000 75,000 15,000 0 Determine the number of calculators sold in June.