Question $2.$

Fuel efficiency $(e,m\frac{i}{g}al)$ of an $18-$wheeler is highly dependent on speed $,$ in $mph$ as well as weight of the truck $(w,$ in pounds$)$:

$e=(6\mathrm{.}12-\frac{w}{60,000})*{0\mathrm{.}92}^{\frac{s-55}{5}}$

Create a VBA function effitiency $(w,s)$ that outputs the fuel efficiency of a truck $($mi$/$gal$)$ of weight $w$ traveling at a speed of $s($mph$)$