Answer:
$18
Explanation:
The initial price is $25
When the first 10% is off, the new amount is (100 - 10)% x 25
= 0.9 x 25
= 22.5
With an additional 20%
the new amount is (100 - 20)% x 22.5
= 0.8 x 22.5
= $18
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