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Mathematics 18 Online
OpenStudy (anonymous):

help! :)

OpenStudy (anonymous):

@Vocaloid

OpenStudy (anonymous):

Alex and Lara have $21.00 each to spend at a book fair, where all students receive a 35% 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, Alex takes 35% 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. Lara takes 65% of the normal purchase price and then computes 110% of the reduced price. Is Alex correct? Is Lara correct? Do they have enough money to purchase the book? Explain your answer using complete sentences.

Vocaloid (vocaloid):

both methods of calculation give the same result, so both Alex and Lara are correct to figure out if they have enough money, calculate the cost of the book and see if it is below 21

OpenStudy (anonymous):

is that the answer?

Vocaloid (vocaloid):

that's not the full answer, I told you to calculate the cost of the book

OpenStudy (anonymous):

oh ok

OpenStudy (anonymous):

how do i calculate the cost of the book?

Vocaloid (vocaloid):

the original price of the book is 28.50, now calculate 65% of 28.50

OpenStudy (anonymous):

19.38

Vocaloid (vocaloid):

check your math again

OpenStudy (anonymous):

do i add, subtract, or divide?

Vocaloid (vocaloid):

65% of 28.50 = .65*28.50 = ?

OpenStudy (anonymous):

18.525

Vocaloid (vocaloid):

good, now calculate 110% of 18.525

OpenStudy (anonymous):

2.03775

Vocaloid (vocaloid):

nope, not quite 1.10*18.525 = ?

OpenStudy (anonymous):

20.3775

Vocaloid (vocaloid):

good, now read the question again and tell me the answer

OpenStudy (anonymous):

um.. i dont know... Both methods of calculation give the same result, so both Alex and Lara are correct. To figure out if they have enough money, we have to calculate the cost of the book and see if it is below 21. So first we do 65% of 28.50 = .65*28.50 = 18.525. Then we do 110% of 18.525 = 1.10 * 18.525= 20.3775. Thats all i got.. can you finish it off for me please :)

Vocaloid (vocaloid):

well, can Alex and Lara buy the book?

OpenStudy (anonymous):

nope

Vocaloid (vocaloid):

read the problem again

OpenStudy (anonymous):

oh wait yes

Vocaloid (vocaloid):

good

OpenStudy (anonymous):

so then what do i write at the end to finish it?

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