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12 August, 03:35

1) Pong paid $20.40 in interest on her credit card last month. The monthly interest rate for her credit card is 1.7% of the balance she owes. What was Pong's balance last month? 3 marks

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  1. 12 August, 03:46
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    We name her balance B so we have

    B x1.7%=20.40

    B x 1.7/100=20.40

    B x 1.7=20.40 x 100

    B x 1.7=2040

    B=2040/1.7

    B=1200

    Maybe we could substract the amount that she paid for the interest so her balance may be 1200-20.40=1179.60 instead of 1200
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