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Samantha earn 12% commission each week for sales of a product. Last week, she sold $6,400 worth of product. How much did she earn in commission last week? If she makes the same amount each week, how much commission will she earn in a year?
A. She earned $533 in commission last week and will earn $6,400 in a year.
B. She earned $768 in commission last week and will earn $9,216 in a year.
C. She earned $533 in commission last week and will earn $27,716 in a year.
D. She earned $769 in commission last week and will earn $39,936 in a year.

To find out how much Samantha earned in commission last week, we can multiply the sales amount by the commission rate:

$6,400 x 0.12 = $768

Therefore, Samantha earned $768 in commission last week.

To find out how much commission she will earn in a year, we can multiply the weekly commission amount by the number of weeks in a year (52 weeks):

$768 x 52 = $39,936

Therefore, Samantha will earn $39,936 in commission in a year.

So the correct answer is D. She earned $768 in commission last week and will earn $39,936 in a year.