Light$-$emitting diode $($LED$)$ light bulbs have become required in recent years, but do they

make financial sense? Suppose a typical $60-$watt incandescent light bulb costs $$\mathrm{.}45$ and

lasts for $1,000$ hours. A $7-$watt LED, which provides the same light, costs $$2\mathrm{.}25$ and lasts

for $40,000$ hours. A kilowatt$-$hour of electricity costs $$\mathrm{.}121,$ which is about the national

average. A kilowatt$-$hour is $1,000$ watts for $1$ hour. If you require a $10$ percent return and

use a light fixture $500$ hours per year, what is the equivalent annual cost of each light

bulb? $($A negative answer should be indicated by a minus sign. Do not round

intermediate calculations and round your answers to $2$ decimal places, e$.$g$.,32\mathrm{.}16.)$