DEPRECATED Area, volume, and surface area

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Problem

The company Digit Tech designs a new SmartPhone. The packaging includes an open box made out of cardboard. The dimensions of the box are 15, space, c, m long, 10, space, c, m wide, and 10, space, c, m high. Digit Tech expects to sell 1000 phones and package each phone individually in a box.
In square centimeters, what is the minimum amount of cardboard Digit Tech needs to package all 1000 new SmartPhones? (Assume there is no wasted cardboard.)
space
  • Your answer should be
  • an integer, like 6
  • an exact decimal, like 0, point, 75
  • a simplified proper fraction, like 3, slash, 5
  • a simplified improper fraction, like 7, slash, 4
  • a mixed number, like 1, space, 3, slash, 4
c, m, start superscript, 2, end superscript