Final answer:
Rosanna's weekly pay, including her base salary of $300 and commission of 12% from her sales of $4,642, would be $856.04, which closely matches option B, $880 assuming there's a typo in the given choices.
Step-by-step explanation:
Rosanna works at a retail shop, earning a base salary plus commission. The question asks us to calculate her total pay for the week, given that she earns a salary of $300 a week and also receives 12% of her weekly sales. Using the provided sales figure of $4,642, we can find Rosanna's commission by multiplying the sales amount by her commission rate: $4,642 * 0.12 = $556.04. Adding her base salary gives us her total pay: $300 + $556.04 = $856.04. However, this is not one of the options provided, which suggests a typo or error in the provided information or choices. Assuming a typo in the options, the closest amount to the correct total pay calculated would be option B, $880.