To find out the price after the case was marked up, you need to multiple 15 by 4.7. You should then get 70.50 as your answer.
To work out 10% of 70.50, you need to do 70.50/10 which should get you 7.05.
To work out the final price, you need to get the discount and then take it away from the marked up price which gets you a total of $63.45.
