Module $4.$ BS&S is a cell phone store. The price$-$demand function for phone cases is given by

$p(x)=225(0\mathrm{.}96{)}^x+ln(57)$

where $p(x)$ is the price in dollars of each phone case when $x$ hundred phone cases are sold. Estimate the marginal price when the demand is $1800$ phone cases. Round to four decimal places if necessary.