Actividad de Razonamiento Cuantitativo

As members of the communal action of our neighborhood, an expansion and remodeling of the headquarters will be carried out, for which the president distributes the calculations to be made among its members. Each one must go to the "Pisende" materials warehouse to quote the necessary supplies for the construction or remodeling of the part of the headquarters that he has to organize.
It corresponds to me to make the costs on the bricks that are required to raise the communal hall to the height of 3 meters, taking into account that the measures of length and width of the room are 20 * 30m and that the height is 3 meters, the area to be built subtracting the areas where the windows will be, Doors and ventolines will then be 280m^2
Thus, several types of bricks have been quoted in several hardware stores: