To determine who earns more money in a week, we need to calculate the earnings of Courtney and Jess separately.
First, let's calculate Courtney's earnings:
Courtney's hourly wage is $26. She works 55 hours in a week, so she worked 55 - 40 = 15 hours of overtime.
For the regular hours (40 hours), she earns 40 * $26 = $1040.
For the overtime hours (15 hours), she earns 15 * ($26 * 3/4) = $292.50.
Therefore, Courtney's total earnings in a week are $1040 + $292.50 = $1332.50.
Next, let's calculate Jess's earnings:
Jess earns $0.05 for every dollar's worth of jewelry she sells, up to $250,000 worth.
Since Jess sells $20,000 worth of jewelry, her earnings would be $20,000 * $0.05 = $1000.
Comparing the earnings, we find that Courtney earns more money in a week with $1332.50, while Jess earns $1000. Therefore, the correct answer is C. Courtney earns more.