Under the price of USD$25\mathrm{.}5/$dozen CFR Rotterdam BB Company signed a contract to sell $1,000$ dozen of T$-$shirt. The T$-$shirt was purchased from factory by RMB$130/$dozen$.$BB Company calculated $3\%$ of its product purchasing price as its overhead costs. The local transport and customs formalities took RMB$2,500$ and the container ocean freight was USD$1,500.$If the bank exchange rate was $1$USD$/6\mathrm{.}5$RMB$,$what would be the export profit margin for this deal? And what about its export cost for foreign exchange?