Christine's total monthly expenses typically amount to $1,800. About $50 of these expenses are work related. Her employer provides disability insurance coverage of $600 per month. How much individual disability insurance should Christine purchase?

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?