The cost of the first 75 units of electricity would be 75 * 12 = N900.
The cost of the remaining 300 - 75 = 225 units would be 225 * 35 = N7875.
So the total cost of 300 units of electricity would be N900 + N7875 = N8775.
In naira and kobo, the total cost would be N8775.
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