How can I calculate Kplc bill from reading the meter?

First pic was taken in Dec 30 and the second was taken today so this is 3months of usage

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Subtract the difference to see the units you have used, then download app ya kenya power. Go to Bill simulation, then eka acc number. Itakuletea option ya kueka hizo units

Sande, I see I owe those buggers 5k

True. I use it