Defining Quantities for Descriptive Modeling Practice Test

Let $r$ = total revenue per day (dollars), $n$ = number of customers per day (customers), $k$ = number of items sold per day (items), and $a$ = average time a customer spends in the store (minutes).

Let $r$ = how interesting the store feels (interest units), $n$ = niceness of customers (nice points), $k$ = coolest book cover (coolness), and $a$ = author fame (fame points).

Let $r$ = revenue, $n$ = customers, $k$ = items, and $a$ = time.

Let $r$ = revenue per minute (dollars/minute), $n$ = customers per year (customers/year), $k$ = items sold per decade (items/decade), and $a$ = average time spent per month (minutes/month).