The Green Thumb Seed Company may purchase a new security system for its lab. Each alternative has a 10-year useful life. Which system should be purchased, based on payback analysis? How much better is the Payback (in years) for the best alternative?

Comparison of Alternative security system based on Costs, Annual Savings, and Salvage Values for I Spy and Gotcha Systems. Column 1: System Type. Column 2: Cost (in USD). Column 3: Annual Savings (in USD). Column 4: Salvage Value (in USD). Row 1: I Spy, $120,000, $20,000, $10,000. Row 2: Gotcha, $140,000, $22,000, $25,000.

Alternative	Cost	Annual Savings	Salvage Value
I Spy	$120,000	$20,000	$10,000
Gotcha	140,000	22,000	25,000