Hello - I'm struggling with this problem below. I'm having trouble calculating the NPV. Thanks for your help!

UPDATE - if this helps, the NPV at 100% was give as 2891.34

The Green Thumb Seed Company may purchase a new security system for it lab. The I Spy system costs $120,000, but will save $20,000 per year is other costs. The system is expected to last 10 years. These numbers are uncertain. The initial cost could be 30% higher or 20% lower, depending on what is found in an upcoming vendor visit. The annual savings could be 10% higher or 30% lower, depending on further research. The life of the system could be 10% longer or 30% shorter, depending on conditions.

Determine the NPV of the Base Case (the conditions we expect). Create a spiderplot containing 3 lines, one for each variable (cost, savings, and system life). Use the attached spreadsheet (page HW 7 #2) to help you draw the spiderplot.

Here's the data given in an excel spreadsheet:

	I Spy		Hi	Lo
Cost	120000		30%	-20%
savings	20000		10%	-30%
int. rate	10%
life, N	10		10%	-30%
NPV	2891.34
		Cost	Savings	N
	70%
	80%
	90%
	100%	2891	2891	2891
	110%
	120%
	130%