Projections, proformers

I am considering adding 5 lifts and one tech to what would become a used car recon center, thus opening up four bays and two lifts in my main shop to put two techs in. The owner wants some figures on ROI, and rightly so. Normally, this is the kind of stuff I enjoy working up, but right now I am feeling dumber than a rock.
So, how would you go about producing an ROI figure, projected payoff time frame etc?
BTW, hows everybodies businessthru the second quarter?
So, how would you go about producing an ROI figure, projected payoff time frame etc?
BTW, hows everybodies businessthru the second quarter?