Stew Beauf is a self-employed surfboard-maker in 2019. His Schedule C net income is $152,800 for the year. He also has a part-time job and earns $9,168 in wages subject to FICA taxes. Calculate Stew's self-employment tax for 2019 using Schedule SE.

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?