Final answer:
Sandra Powers' commission is $325.
Step-by-step explanation:
To calculate Sandra Powers' commission, we need to determine whether her guaranteed minimum salary of $320 or 6.5% of her sales is greater. Since her sales last week were $5,000, we can calculate her commission by finding 6.5% of $5,000.
Commission = 6.5% * $5,000 = $325.
Therefore, Sandra Powers' commission is $325.