Using the above example, can you tell me what my total cost per kilowatt hour would be, if:
- I am using propane for my generator, and pay 1/10th an ounce of silver per gallon.
- All combined, my energy tariffs are 1/15th an ounce of silver per kilowatt hour.

I would appreciate you using Markdown with Math so I could plug the formula into a tool I am writing.
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