Joined: 06 Jun 2008 Posts: 8214 Location: Dubuque, Iowa, USA
Cost of a mainframe job depends upon the charge back method used and could range from 0 for a site that does not charge costs back to something larger than zero. What you want to know is EXTREMELY site dependent and hence any comments you get on a public forum like this should be considered as no more than guidelines, at best.
If your site uses an SMF analysis tool such as MXG, you can find the resources used for different tasks from that tool. However, it is a HUGE leap from resource usage to cost.
The above line seems like a non technical requirement.
If you have automated some manual task and reduced manual effort then you could use a hypothetical formula something like,
Amount saved = the time taken to perform the task manually(in hours) * number of times performed * amount billed/person for 1 hour.
If you want to quantify your automation which reduces manual effort then, MHO is to have a presentation that says something like "2 man hours saved per day as a result of automation".
If you want the calculate the cost of running a mainframe job, then as Robert said it is site dependent and it may depend on several resources like CPU,DASD,TAPE,EXCP activity,time of the day when the job was run, service class etc..