Please find the attachment below for the solution...
Your answer is A.) for ur problem
I think the answer would be C
Answer:

Step-by-step explanation:
we know that
The simple interest formula is equal to

where
I is the Interest Value
P is the Principal amount of money to be invested
r is the rate of interest
t is Number of Time Periods
in this problem we have

substitute in the formula above


You will subtract 12 from 260 and get 248 then you will divide 248 by 8 and get 31 dollars spent per book.