The fourth of four quins intended to develop computational skills with non-negative rational numbers through applications to business and industry, this guidebook on minimum course content is designed for the student who has acquired basic computational skills with non-negative rational numbers. Topics include ratio, proportion, and percentage applications and trigonometry. Overall course goals are specified, a course outline is provided, and performance objectives are listed. Also included is a set of sample test items for skills and a list of resources. (JP)