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Answer:
$425
Explanation:
After the decrease, the sale price is 100% -15% = 85% of the original price. Of course, the markdown is 15% of the original price. Then the ratio of sale price to markdown is ...
(sale price)/(markdown) = (85%)/(15%)
sale price = markdown × 85/15 . . . . . multiply by markdown
sale price = $75 × 85/15 = $425
The sale price of the x-box is $425.