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**RFMNZ****Guest**

I know this is really simple, but I am drawing a complete blank. Thanks!

**Q**: You have a coupon for 10% off the price of a CD. You pay $18 for a CD. How much would you pay if you did not have a coupon?

I know the answer is $20, but I cannot figure out the equation. Thank you!

Finally figured it out.

90/100=18/x

cross multiply

90x=1800

x=20

**bob bundy****Moderator**- Registered: 2010-06-20
- Posts: 7,198

hi RFMNZ

Call the normal price x.

Then

Can you finish it from here?

Bob

Children are not defined by school ...........The Fonz

You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei

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