In a certain city, electricity costs $$0\mathrm{.}20$ per $kW*h.$ What is the annual cost for electricity to power a lamppost for $7\mathrm{.}50h$ per day with a $100.$ W incandescent light bulb versus an energy efficient $25W$ fluorescent bulb that produces the same amount of light? $.1$ year $=365$ days.

$100.$ W bulb: $

$,$year

$25W$ bc

$/$year

A typical incandescent bulb costs $$0\mathrm{.}89$ and lasts for about a year; a typical energy efficient fluorescent bulb costs about $$3\mathrm{.}49$ and lasts for about $3$ years.

Is the additional cost of the fluorescent bulb justified?

yes

no