A task was scheduled to employ two persons, full time, and take two weeks to complete. Instead, the project manager was only able to assign one person to this task. At the end of two weeks, the person assigned to the task was $75\%$ complete. What is the cost performance index?

Group of answer choices

$0\mathrm{.}75$

$1\mathrm{.}5$

$0\mathrm{.}25$

$1\mathrm{.}15$