A school bookstore has the following items for sale. Notebook costs $2.89. Pencil costs $0.79. Folder costs $1.35.

Part A
How much will Luke pay for 4 notebooks? Enter your answer in the box.

$

Part B
Traci uses partial products to find the cost of 14 pencils.

14 pencils at $0.79 each, 10 0.7 = 7, 10 0.9 = 9, 4 0.7 = 2.8, 4 0.9 = 3.6, and $7 plus $9 plus $2.80 plus $3.60 = $22.40.

Which explains whether or not Traci’s partial products are correct?
A.

Traci's partial products are not correct. She should have multiplied 10 × 0.09 and 4 × 0.09. The actual cost is $11.06.
B.

Traci's partial products are not correct. She should have multiplied 10 × 0.07 and 4 × 0.07. The actual cost is $13.58.
C.

Traci's partial products are not correct. She should have multiplied 4 × 0.07 and 4 × 0.09. The actual cost is $16.64.
D.

Traci's partial products are correct. The actual cost is $22.40.