Final answer:
Julie's gross weekly earnings can be calculated by adding her earnings from her hourly rate ($292.50) and her commission ($185.58) to get a total of $478.08.
Step-by-step explanation:
The gross weekly earnings of Julie, a sales clerk at a bicycle shop, can be calculated as follows. She earns $9.75 per hour and she worked 30 hours a week, so her hourly wage can be calculated as 30 hours * $9.75/hour = $292.50. Next, she is given an 8% commission on her sales, so her commission can be calculated as 8/100 * $2319.75 = $185.58. Therefore, her total gross weekly earnings are $292.50 (hourly wage) + $185.58 (commission) = $478.08.
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