Oscar and kim have $22 each to spend at a book fair. where all the student gets a 30% discount . they both want to purchase a copy of the same book, which normally sells for $28.50 plus 10% sales tax. to check if he has enough to purchase the book, oscar takes 30% of $28.50 and subtracts that amount from the normal price. and then computes 110% of the reduced price. is oscar correct? is kim correct ? do they have enough money to purchase the book?