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Maths urgent help needed,

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1.Mr Sim bought new tv at a discounted price of 15%.He paid $836, inclusive of 3% GST(goods and services tax. What was the original price of the tv?

2.How to calculate original price before GST and before discount? What is the formula? Tks

  • Maths urgent help needed, -

    original price = p
    discounted price = 0.85 p
    tax = .03(.85 p) = .0255 p
    so
    836 = .85 p + .0255 p = .8755 p
    p = 954.88

    check
    .85 * 954.88 = 811.65
    811.65*1.03 = 836 good

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