Answer:
$7.20
Explanation:
10% of $9 = 0.9
20% = 1.80
$9 - $1.80 = $7.20
20/100 = 0.20
0.20 * 9 = 1.8
9 - 1.8 = 7.2
The sale price of the DVD is $7.20.
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