The above is true, but only for the 'actual consumption' item of the bill.
In my case below, my consumption of 36 units was billed at 2.50/= per unit to yield the 90/= entry item in the screenshot.
A host of other charges pushed the total bill to 458.70/=.

¡ʇɹoɟɟǝ ƃuıɟɟǝ ǝɥʇ ɹoɟ ɥɔnɯ os ؛uıɐʌ uı ɔıqɐɹɐ ƃuıuɹɐǝן pǝıɹʇ ı