Energy Monitor Price Calculator

I have just gone through and set up a power switch to calculate my energy usage and have been able to set up the Peak, OffPeak and Shoulder with what looks like success. However I’m having trouble figuring out how I can add the Supply Charge to the calculation:

This calculation is cents per day, so it doesn’t run off of the figure given out of the power grid at all.

Currently, I have this:

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