Percent markup based on the selling price: 28.1%
Explanation:
The cost of the TV for the seller was
[tex]c=\$290[/tex]
Of this, the markup of this price was 39%. Therefore, the value of the markup (in dollars) with respect to the cost for the seller was
[tex]m=0.39\cdot 290 =\$113.1[/tex]
So, this was the markup relative to the cost for the seller.
The price paid by the purchaser instead is
[tex]p=\$403.1[/tex]
Therefore, the percent markup based on the selling price (paid by the purchaser) is:
[tex]\frac{m}{p}\cdot 100 = \frac{113.1}{403.1}\cdot 100 =0.281\cdot 100 = 28.1\%[/tex]
Learn more about percentages:
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