Answer:
$54.66
Step-by-step explanation:
First change 20% to a decimal.
Then multiply .20 * 64 = 12.80.
Next do 64 - 12.80 = 51.20.
Now change 6.75% to a decimal which would be 0.0675.
Then do 0.0675 * 51.20 = 3.456.
Now do 3.456 + 51.20 = $54.656.
Then round it to nearst cent if needed. $54.66. And that is your answer.