$(2$ pts$)$ An aggregate sample has a unit weight $($bulk density$)$ of $1500k\frac{g}{m^3}.$ If the bulk specific gravity $($SSD$)$ for this aggregate is $2700k\frac{g}{m^3},$ the porosity of the sample $($between particles$)$ is$.$

Select one:

$25\%$

$55\%$

$15\%$

$35\%$

$45\%$

$q,$