The correct answer is $27. If you mean 10 percent "of" thirty dollars not "off" then it is $3. When do math always replace the word "of" with a multiplication sign. So it would be .1 X $30.
^ youu go girrl.
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$63 dollars. 10 percent of 70 is 7. 70-7 is 63.
10% off of 90 dollars = 90% of 90 dollars = 90 dollars * 90/100 = 81 dollars.
10% off 175 dollars = 90% of 175 dollars = 175*90/100 = 157.50 dollars
$9.50
6.50.