Final answer:
Danielle earned $1,076.25 last week when she sold $4,500 worth of electronics merchandise.
Step-by-step explanation:
To find out how much Danielle earned last week, we need to calculate her commission and add it to her base salary. First, we calculate her commission by multiplying her sales amount ($4,500) by her commission rate (7.25% = 0.0725). Commission = $4,500 * 0.0725 = $326.25. Next, we add her commission to her base salary: $326.25 + $750 = $1,076.25. Therefore, Danielle earned $1,076.25 last week when she sold $4,500 worth of electronics merchandise.