In this task, you need to answer the given multiple-choice question on geometry. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.

Problem: the side of a square is increased by 40 % then how much % does its area increases ? 
Options: a ) 96 , b ) 56.25 , c ) 50.75 , d ) 42.75 , e ) 52.75
a

Problem: the perimeter of one face of a cube is 40 cm . its volume will be : 
Options: a ) 125 cm 3 , b ) 400 cm 3 , c ) 250 cm 3 , d ) 1000 cm 3 , e ) none of these
d

Problem: how much space , in cubic units , is left vacant when maximum number of 7 x 7 x 7 cubes are fitted in a rectangular box measuring 14 x 21 x 17 ? 
Options: a ) 878 , b ) 879 , c ) 880 , d ) 881 , e ) 882

e