30% off $150 = $150 - (0.30 x $150) = $105
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Which do you mean - 30% off or 30% of
It is 78.50 * 30/100 = 23.55 dollars.
1% of 300 dollars is 3 dollars and if you multiply this by 30 you can find 30%, which is 90 dollars.
30% of $22.00 is $6.60
30-21=9 dollars