Final answer:
To determine if Vera has been billed correctly for her purchase, we need to calculate the total cost of her order, including taxes and shipping charges, and compare it to the amount she was billed. The total cost of Vera's purchase, including taxes and shipping charges, should be $20.78, which matches the amount she was billed. Vera has been billed correctly for her purchase.
Step-by-step explanation:
To determine if Vera has been billed correctly for her purchase, we need to calculate the total cost of her order, including taxes and shipping charges, and compare it to the amount she was billed. Let's break down her purchase:
Total cost of 3 5x7 prints: 3 x $0.89 = $2.67
Total cost of 12 4x6 prints: 12 x $0.15 = $1.80
Total cost of 1 8x10 print: 1 x $2.99 = $2.99
Total cost of photo album: $8.69
Total cost of prints: $2.67 + $1.80 + $2.99 = $7.46
Total cost of entire order: $7.46 + $8.69 = $16.15
Tax on total purchase: 7% of $16.15 = $1.13
Shipping charges for standard shipping: $20.78 - $16.15 - $1.13 = $3.50
Therefore, the total cost of Vera's purchase, including taxes and shipping charges, should be $16.15 + $1.13 + $3.50 = $20.78, which matches the amount she was billed. Vera has been billed correctly for her purchase.