Sir, It is a very urgent question on maths project, please help us to do it?

Sir, It is a very urgent question on maths project, please help us to do it???

IF WE HAVE THE SMALL SQUARE WITH SIDE 0.5 CM , THE VOLUME== 9 × 9 × 0.5 = 40.5 CM3
SIDE 1 CM … V - 8 × 8 × 1 = 64 CM3
IDE 1.5 CM … V = 7 × 7 × 1.5 = 73.5 CM3
SIDE 2 CM … V = 6 × 6 × 2 = 72 CM3
SIDE 2.5 CM … V = 5 × 5 × 2.5 = 62.5 CM3
THE FINAL RESULT … IF WE HAVE THE CUT AT 1,5 CM FOR THE CORNER SQUARE THE VOLUME WILL BE MAXIMUM