Consumers' Surplus The demand function for a certain brand of CD is given by the following equation where $p$ is the wholesale unit price in dollars and $x$ is the quantity demanded each week, measured in units of a thousand.

$p=-0\mathrm{.}01x^2-0\mathrm{.}1x+13$

Determine the consumers' surplus $($in $ $)$ if the market price is set at $$\frac{7}{?}$ disc. $($Round your answer to two decimal places.$)$

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