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27 March, 17:08

Oscar and Kim have $22.00 each to spend at a book fair, where all students receive 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. He takes 10% of the discounted selling price and adds it back to find the purchase amount. Kim takes 70% of the normal purchase price and then computes 110% of the reduced price. Is Oscar correct? Is Kim correct? Do they have enough money to purchase the book? Explain your answer using complete sentences and show your work.

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  1. 27 March, 17:31
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    Oscar is correct because,

    .3*28.50 = 8.55

    28.50-8.55 = 19.95

    19.95*.10 = 1.99

    19.95+1.99 = 21.94

    They will have enough money for the book with 6 cents left
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