I purchased my shop from my friend and boss in 2000. There were 4 of us. My brother wrote service, 2 techs and myself. In 2005 I joined ATI. Today there are 13 of us and we purchased our own property in 2006. With the cost of overhead and the high rate of inflation you must find a way to charge more for your service. We do not quote jobs broken down. We quote the finished job. Do not make it easy for people to shop around. We charge $48.75 per 1/4 hour. Seems a lot less than $195 per hour. We use a parts matrix. This allows you to charge more for low price parts. a 20 cent fuse should sell for $2. A 10 X mark up. Obviously you can not charge this for a $100 part. Your average margin at the end of he day needs to be above 50% and shoot for 65%. How are you calculating your margin? Part cost X 1.5 is not a 50% margin. Part cost divided by decimal percent yields the correct margin. $12.50 cost divided by .50 % margin is $25 . You cannot survive on the suggested margin of the parts store or dealer. Remember your competition is manipulating the hours charged for jobs even though they may have a lower rate. Also if you cater to cheep customers that is all you will ever have. Never sell on being cheep. Always sell on the high quality parts and skills you provide. You must take off your mechanic hat and put on your businessman hat. If you do not learn how to charge appropriately you will never grow and likely not survive.