a$.$ What is the NPV of the next five years of cash flows if Darren had four new pumps installed?

NPV $=$$ $($Enter your response rounded to two decimal places.$)$

b$.$ If Darren required a payback period of four years, should he go ahead with the installation of the new pumps?

The project $($should or should not$)$ be undertaken since the payback period is years. $($Enter your response rounded to two decimal places.$)$