Answer:
d. The Changs family paid the correct amount for their purchases
Explanation:
The total of the prices of the goods is ...
$89.95 +239.99 = $329.94
Sales tax adds 6.6%, so multiplies the price by 1.066. The resulting total with tax is ...
$329.94 × 1.066 = $351.72
This is the amount paid, so the family paid the correct amount.