Problem: a metallic sheet is of rectangular shape with dimensions 48 m x 36 m . from each of its corners , a square is cut off so as to make an open box . if the length of the square is 4 m , the volume of the box ( in m 3 ) is : 
Options: a ) 4480 , b ) 5120 , c ) 6420 , d ) 8960 , e ) 7960
a