For an 8W bulb,- it will take 100/(0.008)(9) = 1388 hours for you to spend P100 on electricity (at Php9 per KW-Hr).

So, if you turn on your light for 12 hours a day only (6PM to 6AM),- then this translates to 115 days or almost 4 months.

So, pahabaan na lang ng buhay ang labanan.... You do the rest of the math....

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