A person is riding a motorcycle at a distance of $12$ m from a concrete wall having a transmission loss of $35$ dB$.$ The directivity factor for the motorcycle may be taken as O $=2$ and the sound power level of the motorcycle at $1000$ Hz is $115$ dB$.$ The height of the wall above the level of the motorcycle is $4$ m$.$ On the other side of the wall at a distance of $3$ m from the wall, a person is sitting on a chair. The air temperature is $27\backslash$deg C$,$ for which the speed of sound is $347\mathrm{.}3$ m$/$s$.$ Assuming the source $($motorcycle$)$ and the receiver are at the same elevation, determine the sound pressure level at $1000$ Hz due to the motorcycle noise, at the location of the person on the chair