I found this answer on another Brainly question so hope this helps.
Answer: The total payment is:
P = 2 * ($ 20) = $ 40
The change is:
C = 1 $
The total cost is then:
CT = P-C = 40 $ -1 $ = 39 $
"each book was the same price":
Book price = ($ 39/3) = $ 13
Answer:
each book cost:
Book price = $13
