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Mathematics 15 Online
OpenStudy (anonymous):

Ellen wants to purchase a book that is regularly priced at $18. The book is discounted 15%. She also needs to pay a 6% sales tax on the discounted price. What is the total amount Ellen will pay for the book? Enter your answer in the box.

OpenStudy (anonymous):

@phi

OpenStudy (phi):

ok, any ideas ?

OpenStudy (phi):

what does "discounted 15% mean" ?

OpenStudy (anonymous):

16.22 is the answer?

OpenStudy (anonymous):

it means that $18 - 15%

OpenStudy (anonymous):

you know whats funny???

OpenStudy (anonymous):

i did it all in my head lol

OpenStudy (phi):

yes it means 18 - 0.15*18 15% is how much people tip, and you can do it in your head. 10% of 18 is 1.8 half of 1.8 (5%) is .9 1.8+.9= 2.70 take that off 18

OpenStudy (anonymous):

then you get 15.3

OpenStudy (phi):

then add 6% 1.06* 15.3

OpenStudy (phi):

notice 1.06 * 15.3 is the same as 15.3 + 0.06*15.3

OpenStudy (anonymous):

ok

OpenStudy (phi):

you get the answer, 16.218 which rounds to 16.22

OpenStudy (anonymous):

ok, thx!!!!!!!!!!!!!!! i gave u a medal

OpenStudy (phi):

ty

OpenStudy (anonymous):

uw

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