$30.00 x .15 = $4.50, so it would be $4.50 off.
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Which do you mean - 30% off or 30% of
50% of $30 is $15. The easiest way to do this is to just divide 30 by two, since 50% is half off.
So, 85 % of 18 dollars = 85 / 100 * 18 = 0.85 * 18 = 15.3 dollars (15 dollars 30 cents)
It is 78.50 * 30/100 = 23.55 dollars.
30 cents