Homework Help: math

Posted by Anonymous on Wednesday, March 9, 2011 at 11:56am.

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?

math - johana, Wednesday, March 9, 2011 at 12:20pm
306*0.10= ANSWER (10% is 10/100 or 0.10)

ANSWER*0.15 (15% is 15/100 or 0.15)
math - Reiny, Wednesday, March 9, 2011 at 12:35pm
let the original cost be x

(.9)(.85)x = 306
x = 306/(.9(.85)) = 400

check: 10 off $400 = 400-40= 360
15% off 360 = 360 - 54 = 306

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