How much heat will be stored in a $100$ ft$2$ concrete wall, with $1$ ft$.$ thickness, if it is warmed from $65\backslash$deg F to $85\backslash$deg F by exposure to sunlight?

$($Tip: Use the equation Q $=$ M x C x TD; Convert the volume of concrete to mass before using the formula$)$

$44\mathrm{.}9$ MMBTU

$144$ MMBTU

$44\mathrm{.}9$ MBTU

$144$ MBTU