Find the maximum profit and the number of units that must be produced and sold in order to yield the maximum profit. Assume that revenue, $R(x),$ and cost, $C(x),$ of producing $x$ units are in dollars

$R(x)=6x,C(x)=0\mathrm{.}01x^2+0\mathrm{.}2x+3$

What is the production level for the maximum profit?

$-$units

What is the profit?