Posted by Helen on Tuesday, April 21, 2009 at 11:06pm.
An instrument store gives a 10% discount to all students off the original cost of an instrument. During a back to school sale an additional 15% is taken off the discounted price. Julie, a student at the local high school, purchases a flute for $306. How much did it originally cost?
i know its absurdly simple but my brain feels like mush right now

math  Dr Russ, Wednesday, April 22, 2009 at 5:52am
Do it step wise as the reverse of the original purchase.
So to get back to the discounted price (after the 10%) then multiply the £306 by 1/0.85. Then to get to the original price multiply this result by 1/0.9.

math  Kelsi, Tuesday, June 29, 2010 at 1:43am
100%15%= 85% 306/85%= 360
100%10%= 90% 360/90%= 400
Hope this helps
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