Tess and dan have $24.00 each to spend at a book fair, where all students receive a 15%; discount. they both want to purchase a copy of the same book, which normally sells for $24.50 plus 10% sales tax. to check if she has enough to purchase the book, tess takes 15% of $24.50 and subtracts that amount from the normal price. she takes 10% of the discounted selling price and adds it back to find the purchase amount. dan takes 85% of the normal purchase price and then computes 110% of the reduced price. is tess correct? is dan correct? do they have enough money to purchase the book? explain your answer using complete sentences. be sure to show your calculations for determining the final cost of the book for each student.