About $90
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10% of 300 dollars = 300*10/100 = 30 dollars
30 percent off of $30 would be $9 off.
30% off of 15.00 dollars = (100-30)% of 15 dollars = 70 percent of 15.00 dollars = 15.00*70/100 = 10.50 dollars
300 billion
30% of $1000= 30% * $1000= 0.30 * $1000=$300