Given the following information of a perfectly competitive firm: $--$ Quantity at the profit$-$maximizing level $=10--$ ATC$=$ $$4\mathrm{.}00--$ AVC $=$ $$3\mathrm{.}509.$ The competitive firm is earning a profit if the market price is $"$at least" above $$ $$3\mathrm{.}50$ $$0\mathrm{.}5.$ $$4\mathrm{.}00$ $$3\mathrm{.}10$ $$4\mathrm{.}90$