Consider a program P runs on machine M$.40\%$ of the execution time is spent on floating point instructions, and $20\%$ of the execution time is spent on control instructions $($jump and branch$).$ The rest of the execution time is spent on the other instruction types. Suppose the floating point unit has been improved by a factor of $4.$ In addition, a branch predictor has been used, and it succeeded to reduce the control instructions execution time by a factor of $2.$ What is the overall speedup resulting from these two improvements?

A$.0\mathrm{.}6$

B$.\frac{1}{1\mathrm{.}6}$

C$.1\mathrm{.}6$

D$.\frac{1}{0\mathrm{.}6}$