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Integers

by BTGmoderatorRO » Wed Dec 13, 2017 5:46 pm
Last month a certain bookstore ordered a discount to preferred customers. After the fiÂ…rst book purchased, preferred customers paid $12.99 for each additional hardback book purchased. If a preferred customer purchased a total of 4 hardback books and paid $21.95 for the fiÂ…rst book, then the dollar amount that the customer paid for the 4 books is equivalent to which of the following?

(A) 3(13.00) + 21.92
(B) 3(13.00) + 21.98
(C) 3(13.00) + 22.00
(D) 3(13.00 - 0:01) + 21.92
(E) 3(13.00 - 0:05) + 21.99

OA is A
Hey, guys, I couldn't interpret this question, can an expert help with mathematical analysis? Thanks
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the ans did not appear in the post so posting the ans again

by GMATWisdom » Wed Dec 13, 2017 6:04 pm
Roland2rule wrote:Last month a certain bookstore ordered a discount to preferred customers. After the fiÂ…rst book purchased, preferred customers paid $12.99 for each additional hardback book purchased. If a preferred customer purchased a total of 4 hardback books and paid $21.95 for the fiÂ…rst book, then the dollar amount that the customer paid for the 4 books is equivalent to which of the following?

(A) 3(13.00) + 21.92
(B) 3(13.00) + 21.98
(C) 3(13.00) + 22.00
(D) 3(13.00 - 0:01) + 21.92
(E) 3(13.00 - 0:05) + 21.99

OA is A
Hey, guys, I couldn't interpret this question, can an expert help with mathematical analysis? Thanks
the ccustome has to pay
3(12.99)+21.95 which is equal to
3(13) + 21.92
hence A is the correct opton
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by EconomistGMATTutor » Thu Dec 14, 2017 9:28 am
Last month a certain bookstore ordered a discount to preferred customers. After the fiÂ…rst book purchased, preferred customers paid $12.99 for each additional hardback book purchased. If a preferred customer purchased a total of 4 hardback books and paid $21.95 for the fiÂ…rst book, then the dollar amount that the customer paid for the 4 books is equivalent to which of the following?

(A) 3(13.00) + 21.92
(B) 3(13.00) + 21.98
(C) 3(13.00) + 22.00
(D) 3(13.00 - 0:01) + 21.92
(E) 3(13.00 - 0:05) + 21.99

OA is A
Hey, guys, I couldn't interpret this question, can an expert help with mathematical analysis? Thanks
Hi Roland2rule,
Let's take a look at your question.

Payment for the first book = $21.95
Payment for each additional book after the purchase of first book = $12.99

If the customer purchases 4 books, he will pay $21.95 for the first book and $12.99 for the remaining 3 books. So the total amount he will pay can be calculated as:
$$=21.95+3\left(12.99\right)$$
$$=60.92$$

Let's solve each option one by one to check which one is equal to 60.92,
OPTION A:
$$3\left(13.00\right)+21.92=60.92$$

Therefore, Option A is correct.

Hope it helps.
I am available if you'd like any follow up.
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