Ruff wear expects sales of $560, $650, $670, and $610 for the months of may through august, respectively. the firm collects 20 percent of sales in the month of sale, 70 percent in the month following the month of sale, and 8 percent in the second month following the month of sale. the remaining 2 percent of sales is never collected. how much money does the firm expect to collect in the month of august?

Asupermarket has been experiencing long lines during peak periods of the day. the problem is noticeably worse on certain days of the week, and the peak periods are sometimes different according to the day of the week. there are usually enough workers on the job to open all cash registers. the problem is knowing when to call some of the workers stocking shelves up to the front to work the checkout counters. how might decision models the supermarket? what data would be needed to develop these models?