NPV and Profitability Index

A company finds the following available projects:

The net present value $($NPV$)$ of each project is given as follows:

NPV $=$ Present value of benefits $-$ Initial invesstment.

$($a$)$ Suppose the company has no limit to the available funds today. Which projects should the company

undertake based on NPV$?$

$($b$)$ Suppose the company has a limit in its fund: it can spend only up to $$70,000.$ Which projects should

the company undertake?