The expression that represents the final price of the computer is 1.2x.
Percentage is the fraction of a number expressed as fraction out of 100. Percentages are represented with %.
A mark up increases the price of an item. As a result of the mark up, the price of the computer increases by 20%.
The price of the computer after the mark up = price before the mark up x (1 + percentage increase)
x × (1 + 0.2)
= 1.2x
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