Yes. I figured 10% sales tax plus 25% mark up on the genset. Contractor cost for a union electrician in Chicago is $100.00 PH, $150.00 PH is a loaded service rate. Also I based it on a NG line being in the vicinity of the existing electrical service, thus no propane tank.Are you a contractor, or did you get the rate that you are suggesting? Saying mark up and labor "should be" less is easy to say, unless you got it yourself, or are offering. Every city is different, and I also got a quote closer to 20k for this system, though it included a propane tank and running new gas lines (northern California).