Answer:
I believe that it would just be 20% of the $45 which would mean that you would have to pay $36 a month.
Hope this is helpful!
1/6 = 1 batch, 2/6 = 2 batches and so on
if the factory used 1/2, the factory used 3/6 of a barrel, which equals to 3 batches.
<em>hope it helps :)</em>
Let
. Then
. Note that
.
Recall that for
, we have

This means that for
, or
, we have

Integrate the series to get

