Vera orders some prints of photos that she uploaded to her computer. She orders 3 of the 5 x 7 prints for $0.89 each, 12 of the 4 x 6 prints for $0.15 each and 1 of the 8 x 10 prints for $2.99. She also orders a photo album for $8.69. Vera pays taxes that are 7% of the total purchase price. Her shipping charges are based on the following table: Amount of Purchase
Standard Shipping
Express Shipping
up to $20
free
$3.50
$50 up to $100
$6.35
$8.20
$100 up to $200
$7.80
$11.60
$200 and over
$10.50
$16.45
Vera selects standard shipping and the company bills her credit card $20.78 for the total of the online purchase. Determine if Vera has been billed correctly for her purchase.