I got the answer 3.2 but it said 3.0 was correct?

Question

A student receives his grade report from a local community college, but the GPA is smudged. He took the following classes: a 2 hour credit art, a 3 hour credit history, a 4 hour credit science course, a 3 hour credit mathematics course, and a 1 hour science lab. He received a “B” in the art class, an “A” in the history class, a “C” in the science class, a “B” in the mathematics class, and an “A” in the science lab. What was his GPA if the letter grades are based on a 4 point scale? (A=4, B=3, C=2, D=1, F=0)

A. 2.7

B. 2.8

C. 3.0

D. 3.1

E. 3.2

Answer 1

GPA = 3(2/13) + 4(3/13) + 2(4/13) + 3(3/13) + 4(1/13) = 3.0 (answer C)

The "3(2/13)" is for the "B" in the two-credit art class.

The "4(3/13)" is for the "A" in the three-credit history class.

The "2(4/13)" is for the "C" in the four-credit science class.

The "3(3/13)" is for the "B" in the three-credit math class.

The "4(1/13)" is for the "A" in the one-credit science lab.