Use the information provided in the above table. What is the multifactor productivity of the new process?

a$.$ less than or equal to $6\mathrm{.}0$

b$.$ greater than $6\mathrm{.}0$ but less than or equal to $9\mathrm{.}0$

c$.$ greater than $9\mathrm{.}0$ but less than or equal to $12\mathrm{.}0$

d$.$ greater than $12\mathrm{.}0$