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与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
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Your basic calculation is correct, and for the integer values you provide, the correct output is indeed 560.

Two problems however:

  1. If the discount calculates to a floating point number, your result will be incorrect. You need to force the calculation to be a floating point calculation, e.g. like this (note the 100f):

    float amount = total - (total * discount / 100f);
    
  2. The assignment asks you to round down if the result is a floating point number. Math.round() doesn't round down, it rounds to the nearest integer. You need to use Math.floor() instead or just cast to int:

    return (int) Math.floor(amount);
    // or
    return (int) amount;
    

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
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