math

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?

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  1. 306*0.10= ANSWER (10% is 10/100 or 0.10)

    ANSWER*0.15 (15% is 15/100 or 0.15)

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  2. 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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