Answer:
B) $6.60
Step-by-step explanation:
First, we need to calculate the tax, so we need to find 7% of $12.52 as follows:

Now, Brian will pay $12.52 plus $0.8764 for the tax, so he will pay in total:
$12.52 + $0.8764 = $13.3964
Finally, If he pays with a $20 bill, he should receive:
$20 - $13.3964 = $6.6036
Therefore, the answer is B) $6.60