Ross has an organic fair trade chocolate shop. He buys the chocolate from a wholesaler for $ $3/$ lb$.$ He knows the wholesaler has a $20\%$ margin. Ross would like to add another $20\%$ margin himself. What is the wholesaler's costs?

$ $3\mathrm{.}00$

None of the answer choices are correct $ $0\mathrm{.}60$ $ $2\mathrm{.}40$