One battery costs $1.44.
The unit rate would be

To get that answer, you would have to divide 13 ÷ 9.
I'm not sure if this is what you were looking for, but if it was, I hope I helped! :-)
78+24+11+56+23+117+1
=310
Find his rate:
120 / 15 = $8 per hour
Multiply the rate by hours:
$8 x 20 hours = $160
He will earn $160
Answer:
1/3
Step-by-step explanation:
Ask me in the comments of you need an explanation.
:)