Easy 5k lg gold.

[Sydd]

Help me with my math? 5k lg gold.

Joe went to the book store and the clerk asked him to join the club to get 10% off. It costs $15 to join theclub. He thought about it for a minute, and then discovered that it would cost him $8 more to buy his books if he joined the club.

Question: How much did Joe's book cost without joining the club? Show how you found your answer(type it out)

[Google]

Gosh I hate math xD

[Elliot]

Easy, just put in the equation and it will solve it and show you how to solve it.

Wolfram|Alpha

[Shane]

Nice link!

[Kain]

80$.

The book was 10% off, and the 10% was 8$.
8x10=80

The book is 80$ without the club.

[Google]

80$.

The book was 10% off, and the 10% was 8$.
8x10=80

The book is 80$ without the club.

Isnt suppose to be .80?
10char

[Kain]

'He thought about it for a minute, and then discovered that it would cost him $8 more to buy his books if he joined the club.'

Note the more.
That means 8$ is the ten percent off.
So we multiply it by ten to find the whole.

[Heartbeat]

Help me with my math? 5k lg gold.

Joe went to the book store and the clerk asked him to join the club to get 10% off. It costs $15 to join theclub. He thought about it for a minute, and then discovered that it would cost him $8 more to buy his books if he joined the club.

Question: How much did Joe's book cost without joining the club? Show how you found your answer(type it out)

join club + buy book = $15 + 90% of x
just buy book = ($15 + 90% of x) - $8 = $7 + 90% of x
so 10% = $7
cost of book = $7 x 10 = $70

might have careless mistakes :p

[Kain]

Hm.

Remind me to not do math when i'm tired.

[Sydd]

that doesn't help.

[Smithno13]

Joe went to the book store and the clerk asked him to join the club to get 10% off. It costs $15 to join theclub. He thought about it for a minute, and then discovered that it would cost him $8 more to buy his books if he joined the club.

X=Book cost
Y=Total cost when joining club
.9X+15 = Y

Y=X+8
.9X+15=X+8
-8 -8

.9X+7=X
-.9X -.9X

7=.1X
Multiply the whole thing by ten and you get

70=X

His books cost him 70 dollars without the club.

[Obby]

why would you buy a book that costs as much as a game....is it a nice pop up?

[Smithno13]

College textbooks can cost double that.