1. The calculation formula of the cube surface is: side length * side length *6, with two side lengths. 4*4= 16 (magnification 16 times)

120/4 = 30m2 (width by height)

Some people say it is a cube, and the width multiplied by the height is a face of the cube.

30 * 6 = 180m2

Plus the decrease is: 180+ 120=300 square meters.