Supporting performance objective 51 of the V-TECS (Vocational-Technical Education Consortium of States) Secretarial Catalog, both a set of student materials and an instructor's manual on computing cash discounts are included in this packet. (The packet is the fourth in a set of nine on performing computational clerical activities--CE 016 951-959.) The student materials include a student activity, a check-out activity, related sample forms for performing the activities, and a student answer sheet blank. The instructor's manual includes instructions for duplicating forms and other materials related to the activities, a blank invoice form, suggestions for administering the check-out activity, and answer keys for the activities. The materials are designed for self-paced individual instruction and may be adapted for use with large groups. (A separate booklet--CE 016 911--lists contents for the nine packets in this set along with those in several other sets--seventy-eight packets in all--based on the same V-TECS catalog.) (JT)