Final answer:
To find Olivia's total earnings, calculate her 6% commission on $3,840 in sales, which is $230.40, and add it to her weekly salary of $380. Her total earnings for the week were $610.40.
Step-by-step explanation:
Olivia earns a weekly salary of $380 in addition to a 6% commission on her sales. To calculate Olivia's total earnings, we need to determine how much commission she earned on $3,840 worth of furniture sales. We calculate the commission by multiplying the sales amount by the commission rate:
Commission = Sales × Commission Rate = $3,840 × 0.06 = $230.40.
Next, we add the commission to Olivia's weekly salary to find her total earnings for the week:
Total Earnings = Weekly Salary + Commission = $380 + $230.40 = $610.40.
Therefore, Olivia's total earnings last week were $610.40.