Respuesta :
Answer:
$ 8.40
Step-by-step explanation:
divide 84 by 10 and you will get $8.40.
To find how much they bought each book for, you must divide by 10. 74 divided by 10 is 7.4. Then if they are selling them for 20% more, then multiply 7.4 and 1.2
Your answer is $8.80