You are going to enhance a computer, and there are two possible improvements: either make

multiply instructions run six times faster than before, or make memory access instructions

run two times faster than before. The computer is used for a program that takes $200$ seconds

to execute. Of this time, $10\%$ is used for multiplication, $70\%$ for memory access instructions,

and $20\%$ for other tasks.

$($a$)(2$ points$)$ What will the speedup be if only multiplication is improved?

$($b$)(2$ points$)$ What will the speedup be if only memory access is improved?

$($c$)(2$ points$)$ What will the speedup be if both improvements are made?