In a warehouse, boxes are stacked such that they form 4 layers high and 5 boxes deep going back. The layers are formed as follows: The bottom layer is 20 boxes wide and 5 boxes deep. The next layer is 16 boxes wide and 5 boxes deep. The next will be 12 boxes wide and 5 boxes deep. The top layer will be 8 boxes wide and 5 boxes deep. a) b) c) Determine the number of boxes in the bottom 2 layers. Develop a formula to calculate the number of boxes in n layers. Use the formula from part b) to solve for the total number of boxes needed to make up the 4 layers.