You have a project that must be completed within $12$ months at a cost of R$100,000.$ Six months have passed and R$50,000$ should have been spent, but after an in$-$depth review of the project, you discover that only $40\%$ of the work has been completed so far. What is the schedule performance index $($SPI$)$ for this project?

Question $12$Select one:

a$.$

$0\mathrm{.}9$

b$.$

$0\mathrm{.}4$

c$.$

$0\mathrm{.}3$

d$.$

$0\mathrm{.}8$