Lindsay electronics, a small manufacturer of electronic research equipment, has approximately 7 comma 100 items in its inventory and has hired joan blasco-paul to manage its inventory. joan has determined that 11% of the items in inventory are a items, 30% are b items, and 59% are c items. she would like to set up a system in which all a items are counted monthly (every 20 working days), all b items are counted quarterly (every 61 working days), and all c items are counted semiannually (every 121 working days). how many items need to be counted each day?