Consider the Situation of Firm a and Firm B $$\begin{array} { l l l } & \$ & £ \\\text { A } & \$ 6 \% & £5 \% \\B & \$7 \% & £ 4\%\end{array}$$

Consider the situation of firm A and firm B.The current exchange rate is $2.00/£ Firm A is a U.S.MNC and wants to borrow £30 million for 2 years.Firm B is a British MNC and wants to borrow $60 million for 2 years.Their borrowing opportunities are as shown,both firms have AAA credit ratings.
$$\begin{array} { l l l } & \$ & £ \\\text { A } & \$ 6 \% & £5 \% \\B & \$7 \% & £ 4\%\end{array}$$ If firm B could use the forward exchange markets to redenominate a 2-year £30m 4 percent pound sterling loan into a 2-year USD-denominated loan,what would be the interest rate?