Square pieces of shelving snap together to make cube- shaped stacking shelves. All the faces are square and measure 30 cm by 30 cm . A side face costs $ 1.50 . A top or bottom face costs $1.30. The back face costs $ 1.10. Kate built shelves using 9 side faces, 6 back faces and 9top / b * o * t * t * o * n faces . a) Use linking cubes to build a possible design. b) Draw a picture of your design on isometric dot paper. ) How much did the shelving cost ? d) Is it possible to have the same number of cubes but use fewer pieces ? Explain . e) If your answer to part d is yes, what is the new cost of shelving ? Explain .