8 batteries would cost $13.84.
How I got my answer:
Step 1: I did 10.38 divided by 6. Then, I got 1.73
Step 2: I multiplied 1.73 times 8. Then, I got 13.84
So my answer would be 8 batteries would cost $13.84
Hope this helps!!! :) Pls mark me brainliest!! :)