Traffic lights are increasingly being converted to LED's. Typical incandescent uses $100W$ bulb for each R$,$ Y$,$ G colors. $61$ LED array with each LED require $9V$ at $20mA,$ with $3$ arrays per light, again with R$,$ Y$,$ and G$.$ A small city has $984*(*$Santa Barbara Public Works$)$ traffic lights, one light is always on $\frac{24}{7}.$ Compare the savings in $ per year to convert over to LED if the city pays $7\mathrm{.}2!in$ per kWh$.$